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

I haven't found a vaccum leak, cleaned IAC and it still shows codes 171/174.

by in Wasilla, AK on January 31, 2012
1 answer
ANSWER by , January 31, 2012
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