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ecm electronic control module.

Could also be fuel injectors going bad. Remove the connectors to the 6 injectors and test across the injector with an ohm meter. Should be about 12 ohms. Readings around 6 or less will start showing your symptoms and should be replaced. If you plan to keep the car and it is in good shape other than this issue, I would recommend replacing them all to save time later. If one is failing, the others aren't far behind.

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Q: Why would your 1991 Chevy Lumina 3.1L V6 Run Fine for an hour or so before stalling out and not starting till after it has sat for an hour or so we've replaced many parts?
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