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    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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