there is a little screw on your carburator with a spring on it, its called and idle screw, if u turn it clock wise, u make the idle a bit higher, if u go counter clock wise, then its going to be low, take your servo horn off, turn the radio on and set everything to nuetral, then put it back on making sure that if u turn the system back on the servo leaves the throttle in idle, then start the truck, and while its idling raise the idle a bit, touh the throttle a bit, keep doing that till u get wat u want