I have a 2002 Ford Focus ZTS. It works fine 95% of the time, but the other day I was driving it around and it was working just fine. I stopped at the store for about 10 minutes, and when I went back to my car I tried to start it and it just turned over and then turned off. I tried starting it and gassing the pedal, but as soon as I stopped giving it gas it died again. Frustrated, I went inside another store and 10 minutes later I went back to the car, turned it on and it worked fine! This was the second time that has happened to me. The first time was about a month ago. The same thing happened. I waited a bit and it started again. What is going on?!