1998 Contour Stalls when warm

Hi All
I have a 1998 Contour 2.0L. After 15 minutes to 30 minutes of running or idling it shuts off. It will not start again until a few hours later when it is cold again. Fuel pump is heard priming but no start. I am assuming it is a spark problem as I haven't had a chance to check for spark yet.

Any ideas on this?

Thanks in adavance.

Doug

check the timing