Was driving the truck yesterday, it was very low on fuel and acted a little funny, but I figured it was whatever was on the bottom of the tank. Filled it up at Esso, drove it home, ran fine. Fired it up this morning and it was missing like crazy. Felt like ZERO fire on one cylinder. It was freezing rain and I had to drive my son to school. FUN! Drove him to school, it ran the same (awful) the whole way there and back with no change. Parked it at home, my wife went out with her friend for a bit, it was snowing like crazy at this point. When she got back, I took it up to Ford, figured I had a coil go......... NOPE! #6 spark plug decided it didn't want to work anymore.