When U go to set the cruise on my Bro's truck it will usually start excelerating fairly hard and u have to hit the coast button to slow her down then sometimes it holds and sometimes it starts accelerating again. And even when u do get the cruise to actually hold at a consistent speed when u start up a hill a lot of times when the truck starts to pull down a little and starts dumping more fuel in the truck will start accelerating and continue to do so after u top the hill. The cruise control sucks so bad it is not even really usable. The truck runs fine when u drive with the pedal and there is no other issues with it. So hopefully some of you guys have heard of this issue and no what causes it. Any help would be appreciated. It is a99 cummins 5 speed. Mods include 60hp injectors and 4" exhaust.