My car stalled while waiting for a green light. I had to have it towed. While waiting for the tow truck for about 2 hours I tried to start it sevetal times but would not start. It cranks normally but no start. Car was towed to my house. After a few days when I had the chance to work on it I thought I would try and start it before doing anything further. Well, it started right up.

How do you go about troubleshooting in a situation like this.

Suggestions are appreciated. Thank you.