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International Automotive Technicians Network
Re: 2004 F150 5.4 '5' Lean codes P0171 and P0174
Posted to Technical Discussion Forum on 2/14/2007

ditch that aftermarket pipe and filter.

if a cheap replacement filter, a damaged maf screen, and a slightly bowed out box can cause the problems in the below threads, imagine what a fancy chrome pipe with an oily filter can do.

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