Rough Idle
- Check idle air control soleniod valve.
- Check intake manifold pressure sensor.
- Check intake air temperature sensor.
- Check engine coolant temperature sensor, if symptom occurs only in cold temperatures.
- Check ignition parts; ignitor, ignition coil and spark plugs.
- Check air intake system for air leak(s).
- Check fuel injection components; fuel injectors, fuel pressure regulator and fuel filter.
- Check throttle position sensor.
- Check crankshaft position sensor, ensure component is securely installed.
- Check camshaft position sensor, ensure component is securely installed.
- Check oxygen sensor.
- Check fuel pump.
- Check fuel pump relay.