my chevy van is stalling after driving for 20-30 minutes in 70+ degree heat? on 1996 Chevrolet G Series Van (G10)

My chevy van has been stalling when it gets heated up and the outside temperature is 70+ degrees. It seems that after running in the heat the oil pressure begins to drop when idling. Mechanics have said it is the transmission but I have been running the van fine in the Winter for 2 years with no problems. I think there is a hose or pipe that is heating up the oil or gas and at a certain point it is evaporating and not making it into the engine. any ideas?

wow that is a strange issue and needs more diag work to determine cause of problem seek a 3rd may also have the beginning of a plugged oil pick up screen. have oil pressure tested with a gauge hot and cold to see if pressure is lost hot
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