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Thread: Very rough idle on STOCK platform

  1. #1
    Potential Tuner
    Join Date
    Oct 2016
    Posts
    6

    Very rough idle on STOCK platform

    5.3 with 4l80e swap c10
    stock intake injectors everything stock besides header
    BP stand alone harness
    will run rough smooth out then rough again need to get second opinion im thinking ECM bad
    also headers have different temps on each temperature cylinder some are 150 other at 300
    Attached Files Attached Files

  2. #2
    Senior Tuner
    Join Date
    Nov 2017
    Posts
    1,655
    If random cylinders are different temperature, it’s not a tune issue, unless you are talking about one bank vs the other. This is a mechanical/wiring issue.

  3. #3
    Senior Tuner
    Join Date
    Nov 2017
    Posts
    1,655
    And you should post in the section that applies to your ECM for more help (GM gen 3, 4 etc)