I have a 97 Buick Regal. Approximately 1 & 1/2 years ago the problem started on an intermittent basis. Back then the problem would during a trip occur once every month or so. Now it occurs once or twice a week.
The problem occurs most often when idling at a stop light. The car will be idling smoothly when the tach drops to zero and the car turns off.
There isn’t a period of rough idling, the car simply shuts off.
The dealer was unable to resolve the problem since the problem is intermittent and and no codes were recorded. The dealer cleaned the fuel injection system, but this did not resolve the problem
The problem might be with the Idle Air Control motor. The IAC motor is mounted on the throttle body. It’s function is to allow air into the engine anytime the accelerator is released so that the engine is able to idle. Sometimes these IAC motors malfunction to where they go to the wrong position for the idle condition. This can result in the engine stalling or where the idle goes out of control.
The first thing to try is remove the IAC motor from the thrrottle body and clean it and the idle air bleed port on the throttle body with throttle body cleaner. Reinstall the IAC motor and see if this helps with the stalling problem. If not, then it’s quite possible that IAC motor requires replacement.
Tester