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1998 Oldsmobile Aurora Question: Check engine light came on. Is running a little rough....could it be bad gas?

 

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Moms car, Twentynine Palms, CA, February 06, 2013, 21:20
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Codes P0171, 0174, 0300 came up. How do I find out what they mean? Gas cap has been checked and is good.

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