Runs Rough On Deceleration

Check the following components or conditions:

• Stored trouble codes.
• Ignition system and timing.
• Air intake for leaks.
• Check idle speed.
• Check throttle sensor.
• Dashpot operation.
• Air control valve operation.
• By-pass Air Control System (BAC).
• Injector operating sound.
• Coolant thermosensor.
• Intake air temp. sensor in airflow meter.
• EGR valve operation.
• Clutch and neutral switch.
• ECU operation.
• Engine compression.
• Fuel leakage at injectors.