I have a 6.0 in my 06 dually. When I first start it at the beginning of the day, it runs rough and has no power. It won't hardly get fast enough to change gears. By the time i get to town (7 miles) it runs smooth except it cuts out when i put my foot in it. I was in Texas for three days and when I started it, the water in fuel light came on. It has gotten a lot worse. I have ran some water remover through it but it still runs bad when first started. Any suggestions before I sell it? I have used it for towing campers across America and Canada.