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Tim, I agree with you completely.
What is GM thinking when they charge $300 for a plastic upper intake manifold that cannot withstand the heat of the EGR. Didn't any of those engineers ever burn their fingers on a EGR valve? Have they even opened a hood? Then when your warantee is up they come up with a $$$$ replacement of both the upper and lower manifolds. It takes two guys in Canada to design an effective repair.
Back to your problem:
When the ign is turned on the PCM energizes the fuel pump relay which powers the circuit to the fuel pump. It will remain on as long as the engine is cranking or running and the PCM is receiving fuel control pulses from the ignition control module. The fuel pump relay is #N in the relay center to the right of the glove box. You can apply 12v to the test connector to by-pass the relay and PCM control circuit. Did you try to spray some carb cleaner in the throttle when it won't restart? That would tell you if it's a fuel delivery problem. You will need to test the fuel pressure too. Also check for gas in the vacume line to the fuel pressure regulator.
If you remove the fuel pump relay while the engine is running it should continue to run. If it dies you have a bad oil pressure switch.
I don't understand why it doesn't set the check engine lite. You could have a bad PCM or poor connections to the PCM Check the PCM grounds on the back of the engine next to the oil pressure switch (under the #2 spark plug). Good luck.
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