Hi all,
Still working on a timer issue and hoping that someone might see what I'm not.
Here is a little better explanation and some cleaned up code if you don't mind looking at it again.

The problem is with the TMR0. It seems to not recognize the preloaded value. I can't seem to make any changes that are predictable. The function is this:

1) TMR1 starts a ~30mS cycle with a pulse. (This timer works well.)
2) At the end of the pulse, it loads values for, and enables TMR0
3) First time through TMR0, it should wait ~.9mS for the interrupt and then
enable INT2_INT to capture the count on TMR1 when a pulse comes in
4) At the end of the first TMR0_INT, a new value gets loaded for an ~2.74mS delay,
5) each of the next cycles use the 2.74mS delay until they go through a certain number and get shut off.
6) The next TMR1_INT starts the whole thing again.
Code:
<font color="#000000"><b>DEFINE </b>OSC 8                                              
TRISA   = %00100000      <font color="#0000FF"><i>' PortA : All outputs except RA.1 for INT_INT
</i></font>TRISB   = %01000100      <font color="#0000FF"><i>' PWM1,3,5 outputs,RB2=INT, RB0,2,3: DIO
</i></font>ADCON1  = %00001111      <font color="#0000FF"><i>' Set up ADCON1    
</i></font>T1CON   = %10000001      <font color="#0000FF"><i>' 16bit, 1:1 ps, 30 mS INT 
'T0CON   = %11000101       ' On, 8b, PSon, 1:64  : DIDN'T HELP
</i></font>RCON    = %00011111      <font color="#0000FF"><i>' NO Priority for interrupts 
</i></font>OSCCON  = %11111110      <font color="#0000FF"><i>' INTOSC, 8MHz
'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
</i></font><b>INCLUDE </b><font color="#FF0000">&quot;DT_INTS-18.bas&quot;     </font><font color="#0000FF"><i>' Base Interrupt System
</i></font><b>INCLUDE </b><font color="#FF0000">&quot;ReEnterPBP-18.bas&quot;  </font><font color="#0000FF"><i>' Include if using PBP interrupts
'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
    '   Variable definition
':::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 
</i></font>EchoTime     <b>VAR    WORD
</b>OutPulseCnt  <b>VAR    BYTE
</b>Gain         <b>VAR    BYTE            
</b>PL1lo        <b>CON    </b>$A7             <font color="#0000FF"><i>' Preload for TMR1 LO byte,  Cycle time
</i></font>PL1hi        <b>CON    </b>$15             <font color="#0000FF"><i>' Preload TMR1 HI byte ,PL =5543/ 1:1
'***************************************************************************        
</i></font><b>ASM
</b><font color="#008000">INT_LIST  macro    </font><font color="#0000FF"><i>; IntSource,        Label,  Type, ResetFlag?
        </i></font><font color="#008000">INT_Handler   INT2_INT,   _GetEcho,    ASM,  yes   </font><font color="#0000FF"><i>;straight I/P
        </i></font><font color="#008000">INT_Handler   TMR0_INT,  _BlankGain,  ASM,  yes
        INT_Handler   TMR1_INT,  _Transmit,   ASM,  yes
    endm
    INT_CREATE               </font><font color="#0000FF"><i>; Creates the interrupt processor
</i></font><b>ENDASM
</b><font color="#008000">@    INT_ENABLE  TMR1_INT     </font><font color="#0000FF"><i>; enable Timer 1 to start sonic cycle
'***************************************************************************
</i></font>Mainloop:
<font color="#0000FF"><i>' code here 
       </i></font><b>GOTO </b>Mainloop
<font color="#0000FF"><i>'*********** Int handlers **************************************************
'---[TMR1 - interrupt handler]-------------------------------
' TMR1 = 16 bit, 1:1, 65535 - 5543(preload) =30 mS cycle, (WORKS WELL) 
</i></font>Transmit:
<font color="#008000">@ INT_DISABLE   INT_INT     </font><font color="#0000FF"><i>; Disable external ints to stop Echo RX
         </i></font>TMR1H = PL1hi           <font color="#0000FF"><i>'Preload HI byte
         </i></font>TMR1L = PL1lo           <font color="#0000FF"><i>'Preload LO byte = 
         </i></font>OutPulseCnt = 0         <font color="#0000FF"><i>'clear everything &amp; start new cycle
         </i></font>Gain = 0                <font color="#0000FF"><i>' zero the gain counter
         </i></font>PORTA = Gain            <font color="#0000FF"><i>' turn off the gain
</i></font><b>ASM 
     </b><font color="#008000">BSF</font> 	<font color="#008000">PORTB,0              </font><font color="#0000FF"><i>; pulse out
     </i></font><font color="#008000">NOP    
     NOP    
     BCF    PORTB,0
     NOP    
     NOP     
</font><b>ENDASM

</b><font color="#0000FF"><i>'+++++++++++ HERE IS THE ISSUE and different things tried ++++++++++++++++++++ 
   
 '            T0CON = %11000100       ' On, 8b, PSon, 1:32, For Blanking
 '            TMR0L = 199              ' Blanking delay: .9mS    : NOPE     
</i></font><font color="#008000">@ INT_ENABLE  TMR0_INT                </font><font color="#0000FF"><i>; Enable TMR0 to start Blanking/Gain block
'              TMR0L = 199             ' Blanking delay: .9mS  : WAY OFF! 
'              T0CON   = %11000100    ' On, 8b, PSon, 1:32 
              </i></font>TMR0L   = 40            <font color="#0000FF"><i>' Blanking delay: .9mS : CLOSEST!? WHY???
              </i></font>T0CON   = %11000010     <font color="#0000FF"><i>' On, 8b, PSon, 1:8   
'              TMR0L = 40             ' tried loading after T0CON, no dif             
</i></font><font color="#008000">@ INT_RETURN
</font><font color="#0000FF"><i>'---[TMR0 - interrupt handler]-------------------------------
'  1 cycle through TMR0 with value loaded at end of transmit (TMR1), (~.9mS)
'  then change TMR0 to ~2.74mS increments 
</i></font>BlankGain:
     OutPulseCnt = OutPulseCnt +1     <font color="#0000FF"><i>'1st pass, TMR0 Blanking set @ end of &quot;TX&quot;                                                         
       </i></font><b>SELECT CASE </b>OutPulseCnt
              <b>CASE </b>1
<font color="#0000FF"><i>'               TMR0L = 84            ' PL 2.74mS INT : THIS MESSES IT ALL UP
'               T0CON = %11000100     ' On, 8b, PSon, 1:32, for Gain step              
</i></font><font color="#008000">@ INT_ENABLE   INT2_INT                </font><font color="#0000FF"><i>; enable INT2 to catch Echo        
</i></font><font color="#008000">@ INT_RETURN                           </font><font color="#0000FF"><i>; go back for next INT on TMR0 

'+++++++++++++END OF SUSPECTED THINGS THAT CAN AFFECT THE ISSUE+++++++++++              

              </i></font><b>CASE </b>2
                <b>GOTO </b>MoreGain               <font color="#0000FF"><i>' 2nd pass: Gain inc 1
              </i></font><b>CASE </b>3
                <b>GOTO </b>MoreGain               <font color="#0000FF"><i>' gain inc'd to 2
              </i></font><b>CASE </b>4
                <b>GOTO </b>MoreGain               <font color="#0000FF"><i>' gain inc'd to 3
              </i></font><b>CASE </b>5
                <b>GOTO </b>MoreGain               <font color="#0000FF"><i>' gain inc'd to 4
              </i></font><b>CASE </b>6 <font color="#0000FF"><i>'.......
              '........
              </i></font><b>CASE IS </b>&gt; 14
                <b>GOTO </b>EndGain                <font color="#0000FF"><i>' 
        </i></font><b>END SELECT           
</b>MoreGain:
          Gain = Gain + 2     <font color="#0000FF"><i>' increment gain: RA.0 is I/P, so count x2   
          </i></font>PORTA = Gain        <font color="#0000FF"><i>'sent out RA.1-RA.4 to control gain on amp
</i></font>EndGain:
<font color="#008000">@ INT_DISABLE  TMR0_INT       </font><font color="#0000FF"><i>; Shut-off Blanking &amp; Gain incr until next cycle 
</i></font><font color="#008000">@ INT_RETURN

</font><font color="#0000FF"><i>'---[INT - interrupt handler]-----------------------------------------------
</i></font>GetEcho:
<font color="#0000FF"><i>'@ INT_DISABLE  TMR0_INT          ; Haven't seen a need for this yet    
   </i></font>EchoTime.LowByte=TMR1L        <font color="#0000FF"><i>' capture the counts
   </i></font>EchoTime.HighByte=TMR1H       
<font color="#0000FF"><i>'@ INT_ENABLE  TMR0_INT           ; Re-enable TMR0   
</i></font><font color="#008000">@ INT_RETURN
</font><b>END
  

</b>
Again, thank you for looking at it.

Bo