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Also check the rubber elbow on the PCV tube, mine was cracked and sucking air. Replaced it and the tube, P0174 was gone.
 

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theres a vaccume line on the lower intake on the drivers side that runs to the firewall check that also,mine was cracked and rotted throwing a lean code,its a little bit of a pain in the azz to see and get to, but its there...
 

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and ps never rule out a MaF sensor for them lean codes
 

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