car won't start up some times.

[ShagginJet]

I have a lightly modded 88 Civic HB. I was driving the car pretty hard the other night, pulled over to meet up with a friend, tried starting car to follow him to his house but it wouldn't start. Went with him, came back later (about 40 mins), car started right up.

Drove car to Sacramento that night. All was fine, left it running when filling with gas or stopping to drain the main vain.

Took car to Walmart, drove a little harder then normal driving, parked car and went in store. Came out after about 20 mins, car wouldn't start. returned later that night when it was cooler, car started right up.

Took car to hockey last night, same driving style. Had about a 50 min draft. came back to car, wouldn't startup. Turned key off, ran through all gears (it's an auto), started up just fine.

I'm not sure what the issue is. Might be my started but wanted some opinions first. Sorry for the long post.