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    Tried that and they have no clue. They did send...

    Tried that and they have no clue. They did send me a single race tune and the truck made a lot more power which tells me that the problem is most likely the tune. Any ideas?
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    LML Duramax quit switching tune levels.

    2013 Silverado 2500 with DPF delete and Motorops 5 position tune. Everything worked correctly after install and a few months later the tunes would not switch (always in level 1 regardless of ...
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