SOURCE: 1994 Sierra stalls after it is warm...It will
I had the exact same problem with a 91 GM vehicle.I replaced almost everything including the fuel pump. Months later I discovered I had purchsed and installed a faulty fuel pump,new from the factory.That was the last thing I would of guessed. the fuel pump worked when I tested it but would seize when it got hot during regular driving.One day I decided to let the car run in the driveway until it happened.I sat near the car so I could hear the pump run.All of a sudden the pump started to whine and fade on and off thats when the car shut off.I replaced it it a second time and it never happened again.You may have to put a fuel pressure guage on the fuel rail and run the car and watch when it happens.
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