2007.5 lmm problem HELP
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i think you might have an injector issue or something, it sounds to me like some of the injectors are still getting fuel and it's trying to stay running, the cummins shakes when it is turned off but that is a whole different beast, the duramax should be essentially like turning off a gasoline engine in a sense, relatively smooth, check the motor mounts just to be sure, but you would probably notice that while driving too via vibrations or noises heard in the cab
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