Picked up a 06 f350 single wheel last night for 4900. Trucks in great shape long story short I hauled my little truck and trailer to pick it up then hauled it back with the 350. Truck pulled great never missed a beat good power. This morning drove it to work then at about 1800 rpm in overdrive it made a small skip for about 5 min then quit The truck has all brand new coils and plugs just installed from ford that was the first thing I checked I've had similar problems before but coils solved it. Any ideas were to start?