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

Fuel System

Check the fuel injectors. Refer to Fuel Injector Solenoid Coil Test .

Additional Check(s)

Check for short between B+ and any of the ignition feed circuits. Refer to Fuse Block Details in Electrical Diagnosis.