Can anyone tell me why when I first cranked up and left my truck was skipping really bad, barely running and shaking very violently. When I sat at the stop sign it almost knocked off. Stayed this way for about 5-10 minutes wouldn't go over 45 mph without cutting out? It finally quit about half way home. Its an 05 5.4 3v with 153k on it.

 

sounds like a bad COP(s) or FPDM

 

What is a fpdm? I figured it was a coil but it never once threw a code.

 

This is what my fpdm looked like. I looked it up and I think It may be corroded some.

 

It doesn't look too badly corroded. But maybe. I would also change your fuel filter, clean MAF and throttle body, new air filter.

 

The fuel filter and air filters are clean. we installed a cai a couple months back so the filters clean along with a fuel filter.

 

When were your plugs last changed, if ever? Ford now recommends 60K mile plug changes vs the 100K mile interval recommended when the truck was built.

I chased a cold engine stumble at initial throttle tip in and rough idle for quite a while. Changing plugs at ~72K miles helped a lot. New coils fixed it completely. Truck purrs like it is brand new now (other than the phaser diesel sound) at 79.5K miles.

 

Around 115k im at 153k now.

 

Original coils? If so they are a likely culprit.

 

Nah most of them have been replaced. It wasnt throwing a code like it usually does for coils.