Duramax Fourth Generation: 2007.5-2010 (LMM)
For some reason my truck has a very very slow take off. I have 240k miles. I have run all tunes and it does the same. I really dont want to pay for a lift pump. My fuel filter says 50%. On my dsp5 i have it on the highest hp, it use to through black smoke on that setting but it hasnt in...