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Q: check engine lights came on, headlights flashed off, then car shut down. on 2004 Pontiac Montana

after car sat awhile, was able to start up and drove for approx 2-3 miles before doing the same but the idling sound increased before stopping. haven't tried to start van up since.
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Probably a failing battery or alternator problem. Need to get both tested and replace the faulty one. Odds are its the alternator.
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