Pic 12F683 Pulsout Command

Hi, I'm posting in this area because it my first and want to not disturb any other areas of the forum. But I do have a question. I'm building a 'p' wave generator to send a short ultrasonic pulse though a sediment core. The circuit works using high and low commands for the various ports to trigger the digital scope and ultrasonic generator. And I'm fine with that. But I have had no luck using the pulsout command. I'm trying to send out a positive pulse of 50 microseconds to trigger the DSO and turn on the 40,000Hz ultrasonic generator. But it always sends out a ground state pulse. Here is a test code:

'Test code for pulse Generator Using 12F683 and LED's

ANSEL = 0 'Analog select set to digital
CMCON0 = 7 'Comparitor Off
ADCON0 = 0 'A/D turned OFF
mainloop:

high gpio.1 'Set state
high gpio.0 'Set state
pulsout gpio.0, 1000 ' Send 1000us HIGH pulse to pin 0
pulsout gpio.1,1000 'Send 1000us HIGH pulse to pin 1
pause 1000 'Wait one second

Goto mainloop 'Forever

It's very simple what I need to do, but it sends out low 1000us pulses on both GPIO.0 and GPIO.1

Any ideas? I'm just trying to figure out why it doen't work.
Thanks

what is your OSC value?

PULSOUT toggles the pin twice to create the pulse, so set both pins to ground before PULSOUT for a high-going pulse.

Thanks for all the help. I'm using the internal oscillator at 4 Mhz. I set both pins to low and it works perfectly! Thanks Bruce!
Tom