1993 gmc with a 305motor at 4x4 rough idlestartup

Discussion in 'Performance & Fuel' started by wegnerconstruction, Sep 15, 2013.

  1. wegnerconstruction

    wegnerconstruction New Member

    i have changed pretty much every sensor on the motor and it still runs rough at first start up and blows black smoke for about a minute and then run some what fine but service light comes on then.any ideas out there

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