I was driving my bone stock 7.3 with 196,000. Was running great. Then the check engine light came on. Loss all power. Very rough idle.
I pulled over and shut it off. After 10 mins of letting it sit. I started it. Still rough idle and tried to limp it home. It died on the way home and would not start again. The next day after it was cold it would start. Still a horrible idle and No power at all and white/gray smoke when it's idle . I replaced the cps and the icp. Still no change. What next?

 

Did you pull the code? I'd start by checking the valve cover wiring harnesses. On the outside and under the covers.

 

X2^^^^ sound like burnt UVCH