Coil Pack check ?

Discussion in 'General Chevy & GM Tech Questions' started by CWJ_43, Jan 22, 2012.

  1. CWJ_43

    CWJ_43 New Member

    I'm havin trouble with a slight miss under a load ....03 GMC 2500 4x4 6.0 gas, I'm thinkin a coil pack is breakin down on me ..How can I test , or check coil packs ? un plug a sparkplug wire while engine is runing ? and go from there ???
     

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