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  1. Lean Condition - did I cover all bases?

    Ok...so, I have troubleshooted so much the past few weeks regarding a P171 & P174 code. I am wanting to make sure I have covered all bases before I pull the intake. Here is a brief rundown: 1999 4.0 V6 OHV 4x4 1) Valve Cover Gaskets (and ECT sensor) replaced a few months ago 2) Not sure if...

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