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mass airflow sensor

  1. Loss of mpg after replacing maf sensor

    Duramax Second Generation: 2004.5-2005 (LLY)
    I have had intermittent issues with my Maf sensor for some time, only in higher elevations and just replaced it. After replacement took a test drive, and noticed a decrease is mpg. My truck is chipped with duramileage and get about 24 to 27 mpg unloaded highway miles for years. After replacing...