Ok I just recently bought a 96 cherokee. It has the straight 6 in it and I love the car. I noticed that from time to time the check engine light comes on, but it seems to drive fine. Well today was the first time I floored it since I bought it and it stumbles bad. Normal driving is fine, half throttle is a slight stumbling, full throttle is a bad stumble. It looses power, starts pooping out the exhaust, etc. now if I lift on the throttle it goes away. Does anyone have a clue what I should start looking for ?

Drew

 

Sounds to me like it's going lean, pointing to a fuel supply problem. (the popping you describe makes me think that). Possible culprits would be fuel filter, or fuel pump.
It's also possible that the ignition system is weak - under load, it takes more voltage to get the spark to jump the plug gap. Check the plugs, wires, and distributor cap.
On mine, I had a problem where it would bog down really badly at high RPM, but I confirmed it was going rich, not lean (I have an OBD interface to my computer, I watched the O2 sensor signal). In my case it was a plugged catalytic converter - but I didn't have popping, it would just bog down.

 

yeah it ended up being the fuel pump. I changed the filter as well. The thing runs great now!

 

Hey, thanks for the update. Far too often we never hear back what the problem actually was.
Glad it's working good for you now.