Good Evening... After reading a couple other threads, I have see that issues with the #4 injector is pretty common..
I pulled the #4 plug this afternoon, and it looked like someone had dunked it is some black cement, it was that crusty and built up. I swapped it with the #2 and it ran fine for about 15 miles, and it threw the same code... I am assuming it is the injectors.
If that is what you guys think I am describing please tell me how difficult it is to access and replace.

Thanks Again!!

 

Depends on year of truck as fuel rails changed. (you can put truck info in signature and it will be avalaible)

Disconnect battery ground, swap the injector and see if that moves the problem. Could be valve seals if the crud is oil instead of fuel.

 

What's the code?