Today, I was at work delivering pizzas. Left the car idling for about 20mins. in between deliveries. When I went back out to leave again, the car was stalled. So, I went to start it back up and it would crank and crank and crank, but no start. I don't know what is wrong with it, and wondered if anyone has had a similar experience and could clue me in to what is wrong. The car has plenty of gas, and was running great all day. Any help would be greatly appreciated.