I've got a 96 with the 5.2l. I'm having an odd problem where when I crank my truck up when the motor is warm, it revs up to 2,000 RPM like normal then falls low like it's about to cut off. Also, when I put it in drive, RPM's fall again like it's going to cut off. It also does this when putting the truck in reverse. When I stop at a light, the RPM's fall again. If I'm in reverse and I put on the brakes and stop, the truck cuts off 75% of the time. Any idea what this could be?

 

What happens if you keep your foot on the gas a little?

 

umm IAC sensor. i had the same problem till i used marvel mystery oil in my gas tank, took care of that issue quite well

 

Could be an o2 sensor, pre cat. That was my fix for the problem I had when my truck did that. I went ahead and replaced the IAC as well, little sensor behind the TB. Truck ran fine after that.

 

That's why I asked what happens if he keeps is foot on the gas.

 

Haha since were on the discussion of IAC motors... I shocked my old IAC motor this summer by accident and made my truck run 1300rpm in gear at a light with your foot on the brake lol... Felt like I was power braking it at every light in town. Exhaust sounded good too

 

If I keep my foot on the gas, it will run fine. I do not have a cat on the truck btw. Do I need to change the IAC? Or put something in the gas?

 

LOL! You need to change the IAC. And while your at it clean the TB.

 

I'm sure your torque converter loved that.