For 1990-2009 cars

Checks | Action
--- | ---
DEFINITION: The engine continues to run after the key is turned OFF, but runs very rough. If the engine runs smooth, inspect the ignition switch and the ignition switch adjustment.
Preliminary Checks |

• | Refer to Important Preliminary Checks Before Starting in Symptoms - Engine Controls .

• | Search for bulletins.

• | Inspect the engine control module (ECM) grounds for being clean, tight, and in the proper locations. Refer to Engine Controls Schematics .

Fuel System |

• | Inspect the fuel pressure regulators atmospheric vent hose for the presence of fuel. Replace the fuel pressure regulator if fuel is found in the hose. Refer to Fuel Pressure Regulator Replacement .

• | Test the injectors for a leaking condition. Refer to Fuel System Diagnosis for the proper procedure.