VEHICLE EXHIBITED SUDDEN UNINTENDEND ACCELERATION ON TWO PREVIOUS OCCASIONS. ON THIS THRID TIME IT CAUSED MY WIFE TO REAR END A JEEP CHEROKEE. THE FRONT OF THE VEHICLE, ABOVE THE BUMPER, WAS PUSHED ALL THE WAY TO THE ENGINE. THE AIRBAGS DID NOT DEPLOY. TOYOTA HAS BEEN CONTACTED PREVIOUSLY ON THE ACCELRATION PROBLEM, THEY SAY IT ISN'T THEIR PROBLEM, BUT WON'T GUARANTEE THAT IT WON'T HAPPEN AGAIN. *AK