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Q: 2000 GMC 2500 6.0, it has a rough idle but not all the time. Replaced MAF. Help! on 2000 GMC Sierra 2500

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I haven't found a vaccum leak, cleaned IAC and it still shows codes 171/174.
(1) Answer
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these codes are lean bank one and two could be fuel pressure, fuel filter,but try cleaning you mass air flow sensor 1st, this is a common problem
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