Rough/Unstable Idle or Stalls

POOR IDLING / ROUGH IDLING

Check in the order shown
1. Fuel quality.
2. Engine coolant temperature sensor circuit.
3. Spark plug.
5. Exhaust gas recirculation system.
4. Fuel pressure regulator.
6. Fuel pump.
7. Fuel lines.
8. Idle speed control motor.
9. Compression.
10. Piston ring.
11. Volume airflow sensor circuit.
12. Ignition timing.
13. Timing belt.
14. Injectors.
15. Ignition circuit.
16. Engine control module.
17. Cylinder head.