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Check engine light came on. Is running a little rough....could it be bad gas?

(1998 Oldsmobile Aurora)
in Twentynine Palms, CA on February 06, 2013
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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Popular Answer
of Greg's Orange Auto on February 07, 2013
ck for vac leak and then misfires.vac leak may be causing misfires
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