Rough/Unstable Idle or Stalls

POOR IDLING / ROUGH IDLING

Check in the order shown

1. Fuel Quality.
2. Engine Coolant Temperature Sensor circuit.
3. Exhaust Gas Recirculation system.
4. Spark Plug.
5. Fuel Pressure Regulator.
6. Fuel Pump.
7. Fuel Lines.
8. Idle Speed Control Motor.
9. Compression.
10. Piston Ring.
11. Volume Airflow Meter circuit.
12. Ignition timing.
13. Timing Belt.
14. Injectors.
15. Ignition circuit.
16. Engine Control Module.
17. Cylinder Head.