GM Service Manual Online
For 1990-2009 cars only

Checks

Action

DEFINITION: Engine continues to run after key is turned OFF, but runs very rough. If engine runs smooth, check the ignition switch and adjustment.

Preliminary Checks

    â€¢ Refer to Symptoms - Engine Controls , Important Preliminary Checks Before Starting.
    â€¢ Search for any bulletins.
    â€¢ Verify that the powertrain control module (PCM) grounds are clean, tight, and in the correct locations.

Fuel System

Check for the following conditions:

    â€¢ Any leaking fuel injectors
    â€¢ The presence of fuel in the fuel pressure regulator vacuum line