Symptom Definition
WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
Engine continues to run after ignition is turned off but runs very rough. If engine runs smoothly, check ignition switch and adjustment.