I'm new to the forum, I have an 01 ext. cab 2500HD Duramax, Had the injectors replaced three times, injection pump three times, and replaced all wiring harnesses under warranty. I still don't feel like I have the power I should, any suggestions, keep fuel filter and air filter clean and replaced. I pull around 11000lbs., but without trailering it still feels like I have a lack of power.