Could be caused by one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it

Answered by rasmataz
68 questions asked

well it was running fine till we hit a bump on the freeway. and i'v checked the plugs,wires ,mafm,fuel cutoff switch, tps, and it does it when its cold or ward. just its worse when its warm

Response from hrotten
1 question asked