Originally Posted by TJ Jeeper
When its warm it drives fine until you start to accelerate hardish or climb a hill. Then it starts to stumble and then it knocks/clunks that you can feel in the gas pedal. The jeep has a 2" lift and 32s on stock axles with 3.07 gearing.
This may just be because of the size tires you have with 3.07 gearing. 32s are a little much for that if I'm not mistaken. Basically makes the jeep a 4 speed and would be most noticeable under heavy load/uphill.
The knock you describe almost sounds like a bad catalytic converter. Does it sounds like it's choking when you get deep into the pedal?
Another consideration might be a bad O2 sensor.