1995 Pontiac Transport SE starting problems

As the subject says.1995 Pontiac Transport SE 3.8L with 238,000 km. Tune-up recently done 3000 km`s ago ,with no problems,Fuel filter,Plugs and Wires.
with an oil change. Symptoms are that the van starts no problem when the engine is cold, I can drive it for and hour or more no symptoms all ,shutoff engine . Engine will rotate but not start.Let the engine cool down for atleast an hour and it will start no problems again. Any recommendations would be appreciated.Thanks in advance
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