My truck has 69,000 miles now. You can floorboard it and it will hesitate some of the time. I had this problem about a year ago and had to have it towed to the dealer. It cost $500. They said it had dirty, black diesel fuel. Of course they needed to flush the entire system. It has started again. Thing about the fuel is I buy 99% of my fuel at the same place and I also have a diesel tractor and Kawasaki mule and the fuel has never been black fuel in any of it.