Engine running rough or misfiring can be cause by the following:

http://www.2carpros.com/articles/engine-misfires-or-runs-rough

1.Defective spark plugs

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.Manifold absolute pressure sensor

12.Mass Airflow Sensor

13.Idle air control valve

Note: If it doesn't apply disregard it-

Answered by rasmataz
68 questions asked

This doesnt realy help me too much because I dont have fuel injectors, oxygen sensors, throttle position sensor, IAC valve, MAF. It has a new mechanical fuel pump so it has good pressure, the EGR valve is newer, all vacumme hoses are newer and all the ignition parts are newer. So pretty much everything on here my vehicle is not equipped with or has been very recently replaced.

Response from camaroman17
2 questions asked

Note: If it doesn't apply disregard it-

Answered by rasmataz
68 questions asked