Fail To Accelerate problems of the 2007 Toyota Matrix

Initially the car would fail to accelerate when the gas pedal was pressed down. Even when the gas pedal was pressed down completely the car only went 5 miles per hour. This happened on several occassions. When the car was taken to the dealer the whole "panel board" was replaced. The car was still under warranty and the repair was paid for by Toyota. Then on 2/2/08 the car accelerated on its own, only stopping when it hit a chain link fence. An insurance claim and police report were filed. Additionally the horn was not working and the air bag did not deploy in the accident. The serviceman at the Toyota dealer advised the air bag was defective and Toyota paid for the repair of the airbag. This accident caused my insurance rate to increase. Also the accident negatively impacts my son's driving record as he was the driver.