I WAS DRIVING MY TOYOTA SIENNA 2006 TODAY MORNING AND THE DRIVER IN FRONT OF ME ABRUPTLY STOPPED. I WAS MAINTAINING A SAFE DISTANCE AND IMMEDIATELY HIT MY BRAKES. ALTHOUGH THE BRAKES SEEMED TO ENGAGE, THE CAR ACCELERATED AND VERY BADLY REAR-ENDED THE CAR IN FRONT ME. HAS THIS HAPPENED TO ANYONE BEFORE WITH THE CAR AUTO-ACCELERATING ON IT'S OWN? *TR