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Engine Does Not Run Smooth At Normal Operating Temperature

Check the following components or conditions:

Stored trouble codes.
Ignition system and timing.
Inspect air intake system for leaks.
Idle speed and throttle sensor.
Primary injector operation (non-turbo).
Main fuel line pulsations to indicate operation (turbo).
By-pass Air Control System (BAC).
Air control valve operation.
Check idle mixture.
Purge control valve.
Coolant thermosensor.
EGR valve operation.
Airflow meter operation.
Intake air temp. sensor in airflow meter.
Fuel pressure and fuel leaks.
ECU operation.
Engine compression.