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Thread: 2013 Terrain 3.6lfx

  1. #1
    Potential Tuner
    Join Date
    Jan 2023

    2013 Terrain 3.6lfx

    Helllo everyone new here, 2013 GMC Terrain 3.6 L LFX been tinkering with it with the HP tuners today however I have a surging idle whether in neutral and in Drive haven't had this issue until today any ideas?

  2. #2
    Advanced Tuner
    Join Date
    Aug 2016
    Have you tried flashing it back to stock to see if it goes away? If it does, then you should systemically remove every calibration change you made to see which one caused it. If it doesn't, then you should have your vehicle diagnosed and repaired.