This truck is a Frankenstein. It's originally built for higher elevations for northern Quebec Canada. I've replaced just about everything short of an engine and transmission overhaul. My trouble started after I did my plugs and crank position sensor. Now my scanner says the pcm/ ecm and tipm are communicating. I am currently cleaning up my tipm. And found a wire disconnected from the A port group. The solid red wire from the right bottom of the plug. It will start but runs like it's only on 1/3 of it's plugs. I'm trying to eliminate all other possibilities before buying new coils and ecm/tipm. Any suggestions?

 

What brand crank sensor, and why did you replace it?

 

Try reading engine rpm on your scanner and see if you get any unusual readings. CPS provide engine rpm info. You can also check the CPS with a multimeter.
Heyyou has good question about brand of CPS.