chris837rj

I don't know what the problem is off hand. Do you still have normal power at speed or under a load? Maybe the IP is worn to the point that it is leaking fuel around the piston? Could be a linkage problem in the unit, something bent that idling up will not completely compensate for? I would think it would be a simple adjustment though. The control lever has notches to be adjusted and the idle adjustment arm likely has the same thing. If you take both arms and rotate then a notch or two clockwise and put everything together you should have an increase in rpm's at idle. You can then back off the idle screw and everything will be normal. I would lean more to that problem if the truck had this problem since you bought it though.