I'm sure this issue has been tackled many times, but my sister is having a difficiult time. She has a '92 Lumina that frequently stalls in stop and go traffic when the brakes are appplied to swiftly or suddenly. Most of the time she can restart the car with few glitches, but occasionally the car dies altogether and she cannot restart the car. She recently had the ignition switch replaced in hopes of correcting the problem. I did not think that would have anything to do with her problem. I think it's completely electrical, but I am not a mechanic, much less even a novice. Any experiences or advice would be welcome. Thanks.