1990 no start after driving

I have a 1990 lumina with about 85k miles. the car runs great once it gets started. it does not stall or run poorly. the problem is that after i shut the motor off after driving for any amount of time it wont restart for a few hours. it tries to start but it wont start. it starts on the first crank when the engine is cold. the problem only happens after it has been driven and then shut off and trying to start it up to 2 hours later.

it has a new fuel pump,battery,alternator pplugs.wires,map sensor. Thanks,
STEVEN