2001 Infiniti Q45

Engine Performance problem
2001 Infiniti Q45 V8 Two Wheel Drive Automatic 150000 miles

engine missing changed spark plug wires still missing, could it be a coil or injectors
October 26, 2010.

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. Manifold absolute pressure sensor

Oct 26, 2010.