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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.

Asked by for the 2004 Pontiac Montana
have charging system ck completely incl battery
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2 more answers
Probably a failing battery or alternator problem. Need to get both tested and replace the faulty one. Odds are its the alternator.
Most likely your alternator is failing...have shop check for alternator and battery