Heres my issue. i Had a bad coil wire so i replaced coil wire, coil, plugs, plug wires, and cap and rotor( hadnt replaced those in a long time) and drove fine for a trip (120+ miles round trip) and no it seems to be missing or back firing when i get it up to anything above an idle. this truck is starting to make me want to push it off a cliff and im stuck on hat reason it would be missing like this.

 

Recheck your wires, make sure they are all seated good, and routed per the TSB that you can find in the faq section here. (there is a TSB thread.....)

If that doesn't solve it, pull a couple plugs, and see what they look like.