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What is woung with when engine is getting to much air and not enouth fuel?

(2003 BMW 325i)
in Sylmar, CA on July 28, 2014
codes p0171 and p0174 what should i do to fix this problem?
Displaying 1 answers & 1 comments
Popular Answer
of Greg's Orange Auto on July 28, 2014
vac leak or poss mass air flow sensor
on August 05, 2014
what do you mean by vac leak and could to damage my engine if i use it?
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