Well my mods are on my signature and the truck has 30,500 miles on it. The Sunday i went a trip of about 50 mile each way. It was great on the way and on the way bakc until i got off of the highway. I noticed that i was studdering kind of like a miss in the truck. Now if i go part throttle off the line it will shake and hesitate. Does anybody have any idea what is going on. I also notice the oil pressure would move when the studdering would happen. It is not throwing any codes or SES light or nothing. Please help.

 

Sounds like it's misfiring. How old are the plugs and what type? Check to make sure all the wires are seated properly?