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97 rough idle

  1. Need Help from Powerstroke Gurus

    Diesel Diagnostics
    I have a challenge for you powerstroke Genius's. I am hopping to get some help diagnosing my 1997 F350, Powerstroke with manual transmission. Here is what it is doing: Rough idle. Rough running up to 2000rpm. loss of power. Bad mpg. Down to 12mpg or less from 16-18. occasional surging while...