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Need help with P0171 p0174
Im at a loss as to what is causing these lean codes. so far i have: replaced downstream o2 sensor replaced iac (it was howling and truck was dying out at stops.) replaced one verified leaking vacuum line. replaced upper intake and fuel manifold gaskets. ive smoke tested and used propane and...- antihero214
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- Replies: 10
- Forum: General Discussions