Pontiac: pontiac 6000, pontiac 6000, coil pack

Question
Dear Harold ,
Thanks for taking the time to help.
Pontiac 6000 /1989/ 330 000 mileage
Sir, this has me stumped.
About a week ago , it started to act up. I would drive to point A for messages, stay about 10 minutes in a store and come back out..car will not start. I checked everything, Sparks, wires, liquids, all were in tact. Leaving the car sit for an hour + and it will work again .
Took it to the garage and they were also stumped. They let the car run and really gave it a run and it never stalled for them once. Everything checked fine on the computer for the mechanic. He suggested the coil pack was fried so I replaced that. Two days the car was running fine and suddenly today the same problem is happening. I took it to work and back (45 minute drive there and back) brought it home ( sat for 2 hours ) took my son to Karate ( the car sat for 2 hours ) and when I got in it to go home , it would not start. Also , the engine was extremely hot.Even after the two hour wait. I just have not got the foggiest idea on what is wrong with it at this point. All major components are fine and the engine was well maintained all through the years, but this has got me very confused.
Thank you so much.
John

Answer
First of all I need to know what engine is in your car.
How did you check for spark?
You said you took it to the garage and it never stalled for them. Do you also have a stalling problem or were they not looking for the same problem that you described to me???? Because you described a no start after a hot soak, not a stalling problem.