I didn't replace the oil pressure switch. I let it heat up again trying to diagnose the problem. The motor suddenly shut off again. I couldn't hear the fuel pump prime so I checked the fuel pump fuses and even swapped the relay module back to test it. Still nothing. I cleaned the negative battery terminals and found that one of them had broken off. Replaced both ground terminals, cleaned battery connections. It started right up. It still lopes when warm, but doesn't stall as easily. I may buy a couple cans of air and spray a few components (can upside down) tomorrow to see if the heat is causing a fault in an injector or the coil pack. I re-checked all the vacuum hoses and intake gaskets for leaks, but didn't find any.
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Bought a 2005 Avalanche recently. Also have a 2001 Saturn SC2 and 1987 Chevy S10 Blazer. The Blazer is going to be a roadster w/suicide doors, custom frame, and secret drivetrain. No hints. Don't ask.
