[John Rogers]

If you have spark, then there must not be any fuel? Get a fire extinguisher handy. When hot, turn on the key and move the throttle shaft and you should hear the burrrrp of the injectors. If not the FI points may be failing as I had a set that did this when they were hot, after replacement the trouble went away. If they fire, remove an injector (very carefully) put it in a can and try to fire the injectors to see if fuel comes out the injector? The fuel pump could also be failing when hot or vapor locking so there is no pressure? Good luck