See repair shop or dealer
SOURCE: Jeep Hesitates. P0303 code
Check the cylinders Commpression. over 115 psi is good, 120 psi is normal.
SOURCE: 04 jeep grand cherokee bucks and jerks while
Look for noise in the TPS circuit that can cause TCC to lock and unlock.
SOURCE: jeep starts and idles perfect no acceleration,
Sounds like the catalytic converter or muffler are clogged. There isn't much exhaust at idle, but when you accelerate your exhaust volume increases, thus if your catalytic converter or muffler are clogged the restrict the exhaust escaping out thus causing an excess of back pressure which won't allow the engine to breathe normally.
SOURCE: Have no power on acceleration, backfires 4.0L Jeep
could it be your throttle sensor? If it is a carbureted engine, check the accelerator pump inside the carb.
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similar problems: my front oxygen sensor was bad causing problems after 20-30min cool down (replaced and was fine). Also under certain driving conditions I was getting bucking, hesitation and backfiring due to battery sliding into computer wiring harness disrupting sensor input/output signals. I placed a 1" spacer on rear battery clamp pushing battery forward and it cured my problem.
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