Engine Misfires Or Hesitates
- Ensure vacuum hoses are not disconnected or damaged.
- Ensure electrical harness connectors and wires are not broken or loose.
- Ensure fuel pressure is correct.
- Check cold start valve for leaking (engine warm).
- Check airflow sensor plate adjustment.
- Check airflow sensor voltage output.
- Check throttle valve switch (Vanagon).
- Check coolant temperature sensor operation.
- Check Oxygen (O2) sensor voltage output.