Hey Everyone, I Have an 2008 XLT, 4.6 Liter, AWD with 3.55s. I was told that this thing would pull my Enclosed 6x10 with complete ease, and with it completely loaded it weighs around 2200. When I am in town I can barely tell that its even hooked up, but as soon as I hit the Highway its like I am pulling a semi trailer. I just do not get it, everything on it is new, no codes except the P1000 and it just acts like its weak as hell. Changed the in like fuel filter a few weeks ago only to find that it was filthy as all hell, never seen one this dirty, and now that it is clean again the truck runs completely different. I was excited to see if it pulled the trailer better once I changed that but it does not, its just a dog. The transmission sometimes wont shift up into the next gear after I have pulled a while and that only happens when I am getting back on the highway, I have to let off to get it to shift, but then it quits doing that again, I have been working on cars since I was in my teens but this one is killing me. Anyone have any suggestions that might change something, as I am at a loss here.