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  1. S

    P0171 & P0174 Trouble.

    Yeah, I don't know. It just seems funny that this would be the first time it would ever do it, after I replaced those items. It was close to -30* C, so I suppose it could have been some ice in the fuel lines.
  2. S

    P0171 & P0174 Trouble.

    4.0 V6. I believe its the OHC.
  3. S

    P0171 & P0174 Trouble.

    '99 Ford Explorer, Ran like a typical Explorer with Intake Manifold Gasket problems, Error Codes: P0171, P0174, P0135, and Cylinders 1, 2 and 3 misfiring. Changed Intake Manifold gaskets, 171 and 174 came back on, ran a circuit test, cleaned MAF sensor and changed O2 sensor (passenger...
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