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  1. Low Power and excessive white smoke

    General Discussion
    2004.5 LLY Sierra 2500HD with 165k miles Lately the truck has been bogging down after sitting at a stop light and when I go to take off it'll just blow white smoke. I have to put it in neutral whomp on it, it builds some pressure and puffs out white smoke and eventually the truck will blow some...
  2. 07.5 LMM doesn't seem to coast

    07.5-10 LMM Duramax Powertrain
    Hi - I have learned a lot from you folks and I hope someone can help me understand what my truck is doing. My truck does not coast. It always seems like the transmission is braking. Not a lot but when I let off the gas there is a noticeabIe drag. I have had the truck a year and have put...
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