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I have tried everything, but I am coming to the conclusion that I have a bad pcv letting in too much air. The concensus of how to fix it seems to be to clean the MAF with some electical cleaner or brake cleaner. Basically, you are getting too much air into the throttle body after the MAF or a dirty MAF. both banks running lean indicates a vacuum leak....i had a similar problem with a customers vehicle and i found a vacuum leak at the rear of the intake was a cracked hose. _ caprice nut

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โˆ™ 2008-04-01 01:35:33
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Q: How do you fix bank 1 and 2 if they are too lean and the codes and come up with P0171 and P0174?
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