i was coming home from work today, and all of a sudden if i pushed past quarter throttle it felt and sounded like my exhaust brake came on. if i held the pedal it would still accelerate but felt like it was fighting itself then it was fine above 2300 rpms. I have been running with my egr unplugged for the last 5000 miles so i cant tell if it threw a code, i shut it off, plugged in the egr and now it runs fine. has any one come across this problem?