It probably needs a major tune-up, when was it? Also do you have a check engine light
Engine running rough or misfiring can be cause by the following:
1. Defective spark plug
2. Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4. False air leakage.
5. Faulty fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
10. Throttle position sensor.
11. Idle air control valve.
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Tuesday, September 21st, 2010 AT 8:54 AM