[MTBikerTim]

I would say rebind the receiver making sure the throttle stick is at neutral. The fail safe should be kicking in and it should go back to neutral but it sounds as though yours is full stick. If it becomes a major issue pull the receiver from the car and test it with just servos and see if it does the same thing. If it does contact horizon because they replaced mine which did the same thing at close range (except it would go to fail safe positions).