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Re: 04 avalanche 5.3 running lean on bank 1
does it have any misfire codes also? what manifold seals...intake or exhaust? pull the spark plugs on bank 1. how do they look? is one of then kinda white looking, or all 4? post back what you find!
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Disclaimer: I am not perfect, i may be wrong in my advice from time to time. Also note that any advice given is as is with no warranty whatsoever, and i have zero liability if you get hurt for not being safe while working on your vehicle.
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