ANSWERS: 2
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Well, you apparently have fixed the pressing problem of startup stalling. So, why is your car running for 25 minutes, up to a few hours? idling, i assume and wasting gasoline. This answer is simple, turn the ignition switch off and take out the key.
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Check the ignition module. Specifically, the circuit board under the coil packs. They aren't in a good spot...exposed to high heat. Same symptoms happened to my 92 Cavalier Z24 and my neighbors Lumina. Good luck!!!
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