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  1. J

    Engine Misfiring on Bank 1

    Recently my 2003 Sport Trac XLT 4.0 started i misfire on bank 1 and threw codes P0300, P0301, P0302, P0303 and the o2 sensor read rich. I replaced the coil and nothing happened but it would only misfire under load and then again it would only do it every so often and not all the time. Now the...
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