poltern while driving

Hello I have the problem that it accelerates with my car when it’s stronger or slows down for a short time than if something is loose! if it’s poltert when it’s braking because it’s there again when it’s going on! if I quickly steer it too! had the car already on a stage but could not find anything except the 2 rubber rings on both sides were torn at the top of the dom camp! can that be the poltert? if so why is it poltert when it’s driving?