When The Engine Is Cold, Idle Speed Fluctuates

When the engine is cold, idle speed fluctuates

Diagnostic Procedure:

1. Troubleshoot the injector control module circuit. Injector Control Module Circuit Troubleshooting

2. Replace the fuel filter A element. Fuel Filter A Element Replacement

3. Replace the fuel filter B element. Fuel Filter B Element Replacement

4. Troubleshoot the alternator FR signal circuit. Alternator FR Signal Circuit Troubleshooting

5. Inspect the PCV valve. Testing and Inspection

Also check for:

- Clogged injector