Car Accelerates On Its Own problems of the 2006 Toyota Scion Tc

I own a scion xa, my dealer insists there is nothing wrong. The car lunges and suddenly accelerates and sometimes, it is hard to get it to slow back down the tachometer lunges past 4. I do not have floor mats. The dealer insists it is me not the car. This car accelerates suddenly and it has happened several times. Something is definitely wrong with this car. One time I couldn't control the speed at all nor would the brakes work. I am not making this up.

I took a 2006 Scion Tc in for a mechanic to investigate the cause of a "check engine" warning light. During his test drive, the vehicle reportedly unexpectedly accelerated and raced almost out of control. Per the mechanic, feedback from Toyota suggested the incidence was caused by a defective throttle body/sensor. According to the mechanic, the replacement part now offered by Toyota reflects significant modifications when compared to the original equipment.