October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Engine Runs Rough On Deceleration

Verify idle speed is correct.
Verify correct throttle body dashpot adjustment.
Check coolant thermosensor and throttle position sensor.
Check by-pass 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.