Engine Runs Rough On Deceleration
- Verify idle speed is correct.
- Verify correct throttle body dashpot adjustment.
- Check coolant thermosensor and throttle position sensor.
- Check bypass air control valve or IAC valve for malfunction.
- Check fuel pressure regulator.
- Check HO2S operation.
- Check throttle position sensor and closed throttle switch.
- Check airflow sensor operation.