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carbon cleaning

  1. GDI Carbon Build-Up

    New Member Introductions
    Hi everyone, New to the VW group. I love my 2.0 Jetta but have been running into some problems. My Check engine light came on about 3 months ago when I started it up one morning. It ran rough for about a min and smoothed out. My mechanic found random misfires in all cylinders. After he changing...