what could cause a car to not stay running after heating up?

1988 CHEVROLET CORSICA
15,800 MILES
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SHELLBELLZ77
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we have a 1988 2.8 liter 6cyl chevy corsica that will not stay running once it heats up. it will start, run for 20 mins. and then not start again. Also when running, it will slowly reduce speed until it stops.Something is heating up and making it not run, can't figure it out.

We have checked the fuel pump pressure, checked the spark plugs,distributor cap,vaccum lines. Replace EVERY sensor we can,replaced relays, got brand new coils, and got the module tested it's good. Haven't replaced maf cuz it's as clean as a whistle, however when we take out the air filter and blow into it, it does act like it wants to stay running. If nothing else, that will be next. And then perhaps the oil sending unit/switch Any ideas?
Feb 8, 2012 at 12:52 AM
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