I clear it here

T1CON = %00100000 ' stop TMR1
PIR1.0 = 0 ' clear bit 0 TMR1 interrupt flag
TMR1H = $8C
TMR1L = $A0 ' loads 36000 - gives 24 mS on CRO
T1CON = %00100001 ' start TMR1

joe, I think you answered my question. It does have to be in the ISR.
So syntax..... bcf PIR1.0m will this work?