OKAY, I replaced the complete fuel pump assembly along with new lines and filler tube which were all rotting quite badly. Guess what, it fixed the high fuel pressure condition. My pressure is now holding steady at 50 psi instead of tho 100 psi plus that I was getting before. However, I still have the original problem. I've checked the plugs and none of them are fouled. The cap, rotor and wires aren't that old so I'm assuming they're okay. You can tell the engine is missing while it's sitting in the yard and you step on the gas it will run a little rough. It's worse when you're out on the road. It misses as you're accellerating, but it gets extremely bad once it shifts and the rpms drop. The whole truck will shake violently at that point. I'm thinking this may be the coil because I can't see a problem in a single cylinder causing the engine to miss that badly. Obviously a bad coil will affect all the cylinders.The only code I get is 1-2. Any thoughts would be appreciated. Thanks.