general problems of the 2007 Toyota Matrix

I own a 2007 Toyota Matrix that was experiencing unexplained surging and acceleration while at a stop and at idle. The engine would rev unexpectedly causing the car to lurch forward. This happened while sitting at a stop with my foot on the brake. I took the Matrix to the dealer but they could not find what the problem was until the check engine light came on. The car finally go to a point where it would rev up by itself to as much as 4000 rpm. It finally got to a point where it was undrivable. I took the car to the dealer and after 2 days it was determined that the electronic throttle body was malfunctioning. The dealer is currently replacing the electronic throttle body at a cost of $1,350. I believe that this is a problem that effects more Toyota models and years then what has currently been recalled.