Some of these vehicles have had issues with this with no real fix.
The timing can't be adjusted anymore
What kind of oil and oil filter are you running? I know Ford has had issues with the intake o-rings but that is usually a idle issue more than acceleration issue.
I've heard of some guys finding the valves not hitting right on the passenger bank on those trucks and adjusting or replacing the rockers to fix it. But another thing is to check the EGR ports. As the EGR actually has ports to each cylinder and as the miles pile on, the clog up slowly and wind up blocking up shoving more EGR flow to other cylinders.
A easy way to find out is to block and plug the EGR and go for a road test
Tuesday, August 25th, 2009 AT 7:54 PM