My wife was stopped at a red light and the car just shut off. No warning or nothing. She tried to start it and it died right away. She tried again and it started and seems to be running ok. Any ideas as to what could have happened? She is nervous to drive it now.

 

This happened to me in 2007, when I was test driving an HHR. It quit at a relight and would not start right away. I drove it back to the dealer and got a different one. I think it was the 2.2L engine.