On several occasions, my car has suddenly revved up to 6000 rpm, start jerking and revving up; and a random error will pop up on the dash. when this happens, if you let off of the break the car will automatically speed up to 40 mph without pushing the gas pedal down. sometimes it will happen while driving, and sometimes it will start as soon as the car is started. it doesn't matter what kind of road the car is on. sometimes the car just jerks and displays an error. the most predominant error is "esc off no hill start". sometimes it says "coolant temp high". i have taken it to the dealership several times and every time i do they say they are unable to "retrieve an active code off of the computer or duplicate the problem." one time, they replaced the computer in the car because they read high voltage coming off of one of the circuits, but the problem continued after that. my wife recorded a video once where it counted down from 3 to 1 and then suddenly revved up. she also showed different videos that she had made of it at different times to the dealership and they just flat out said they didn't know what was going on.