G16 Cuts Out If Not 3/4 Or Full Throttle

[DROPPINEM]

Hello guys I am kinda new to the cart scene.I purchased a 1998 g16 from a friend who had just got the cart and rebuilt the motor,installed a 6" jakes kit,as well as a light kit then just got tired of messing with it.I purchased it and built a bed for it,camo'd it,installed a winch,power kit and two gun racks.As you can tell it is a hunting buggy.The problem i am having is when trying to "cruise" the roads at my hunting property it bucks and jerks at low speeds but as soon as you push the accellerator past the halfway point it runs like a scalded dog.I have studied the wiring diagram and was curious if the acc stop switch may have someting to do with it.I have yet to look at the switch but is it adjustable......ANYONE EVER SEEN THIS BEFORE-THANKS.....by the way i am an ASE master automobile technician so you can get technical if need be.