Question about 2000 GMC Sierra
Lean banks 1 & 2. Most likely a vacuum leak, but could be a dirty or bad MAF sensor, clogged injector(s), bad O2s(although I doubt 2 go bad at the same time), etc.
Those are always fun to diagnose. I would focus on the vacuum hoses and try cleaning the MAF elements with CRC MAF cleaner or electrical contact cleaner.
Posted on Oct 20, 2013
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Posted on Jan 02, 2017
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