I have a 2012 F-250 6.7. I have the basic superchips programmer set at performance. I set it at 2000 miles and have 5000 miles on the truck now. There have been two different times that I have been cruising down the interstate and stomped the gas. My truck will accelerate and then all of a sudden feels like it downshifts real hard and my truck shuts off. I have had to pull off the side of the interstate, turn my key off, and then start my truck back up. It always cranks up fine then. I have had no other issues with the truck at this point. I am not a big fan of the superchips. I ultimately want to buy an H&S MM and do the deletes. I personally asked my service manager about doing it thinking he would overlook the warantee issue as much as possible. We have about 40 fleet trucks that we service there on a regular basis. He told me there is no way to overlook it anymore because of how strict Ford has become when it comes to warantee work. Anyways, is the problem I am having superchips related? I figured I could get away with just running a tuner and setting it back to stock before ever taking it in. If they happen to notice I have been running a tuner, I have heard from others that this dealership will normally just tell you not to run it anymore the first time they notice it.