Car Throttle Stuck problems of the 2010 Toyota RAV4

I was on the freeway and entering a freeway ramp to another freeway in a turn and I let my foot off the gas and the throttle stuck and actually my car began to speed up on its own! my foot was not the gas at the time I let it for a sec and than it was like I slammed on the gas going into the turn on the ramp it scared the hell out of me its the first something like that happen to me. It sped up from 65 to around 68 and than it was off to the races so I hit gas pedal and than the breaks and it started to slow down I was at the turn of the ramp witch didnt help it was really bad for a second I was like what the hell and when I noticed I made sure my foot was not on the gas and than it accelerated even more!!!.

With the vehicle in park and the brake pedal depressed, the engine reved immediately to around 6000 rpm when started. I turned off the engine without shifting out of park, got out of the car, and visually checked the floormat. It was not touching the throttle pedal and the throttle pedal did not appear to be depressed. After approximately 1 minute I started the engine a second time and the same thing occurred. I then waited approximately 5 minutes, pumped the throttle pedal several times, then started the vehicle a third time. This time the vehicle started normally (engine idling). I then drove home without further reving issues and have not had any reoccurence since the incident date. I took the vehicle to a local Toyota dealership for service the next day and was told that it was a floormat issue, and my driverside floormat was removed by the dealership. I disagree with this assessment. It is important to note that before I had the reving issue upon starting the vehicle, my last interaction with the vehicle was to have my foot completely off the gas pedal as I was steering the car into a parking space, when I was using only the brake pedal to moderate my speed, with no throttle pedal pressure being applied by me, and with the engine idling, as is normal. Do not see how this could be a residual stuck throttle pedal issue when I returned to my automoble and started the engine to drive away. The only other factor which may (or may not) be relevent was that when I turned the engine off after parking, I did not first turn the radio off, which I usually do. I believe I was tuned to a satellite station at that time (xm).