For 1990-2009 cars

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 |

• | Refer to Powertrain On Board Diagnostic (OBD) System Check .

• | Refer to Intermittent Conditions .

• | Search for bulletins.

Fuel System | Check the fuel injectors. Refer to Fuel System Pressure Test , Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Outside 10-35 Degrees C (50-95 Degrees F) , Fuel Tank Leak Check .
Additional Check(s) | Check for short between battery positive voltage and any of the ignition feed circuits. Refer to Fuse Block Details in Electrical Diagnosis.