iam haveing some problems with my 94 xj if you try to take off or power break it bucks like some one is shut the jeep off then on again i have replaced coil plugs cap and rotor fuel filter crankshaft sensor and cleaned and tested tps and map sensor and it still does it [ also if your doing like 30 and stuff the pedel it will take off fine most of the time and if you hit a bump it bucks].
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