I have a 96 mack rd688s with the mechanical E7 350 it just started having this problem where if you pull out loaded in soft ground or pull out loaded on a hill where the motor is really under a load it revs up by itself and you can feel the fuel pedal being pulled down, now it did this once before but the motor mounts were wore out we changed the motor and transmission mounts just 3 months ago and they all still look good no broken bolts or anything, is there anything besides mounts that could cause the problem
