This guy has no spark plug wires. He has a coil on top of each plug. I'd keep checking codes. A code reader can be had for 60 or 70 bucks. Get one that doesn't just give the code but tells you what it means too.
Driving the truck with that kind of activity is very hard on the drive train. In case you don't know those of us with the early 4.7 have an engine that blows head gaskets far too often. I'm new to my truck too so am not sure if my 02 has a tranny that has too many issues. They put a new auto in the 02 so they may have fixed the problems but I'm not sure. Good maintenance will pay off.
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