When at a full stop the vehicle has a hard time moving/accelerating. i take my foot completely off the brake and the vehicle will not move. when i press the gas, the vehicle will jerk very badly and jump like it is a stick shift, but it is not. when it finally gets moving it continues to jerk, sputter and jump. this has been going on since i purchased the vehicle. i have taken it to several dealerships for this issue and i am repeatedly told that without a code or the vehicle duplicating what it does there is nothing that can be done.