I WAS HEADED HOME FROM WORK AND MY TRUCK WAS STATIONARY STOPPED AT A STOP LIGHT, AND THE AUTOMATIC ENGINE STOP WAS ACTIVE, WITH SYNC NETWORKED. A VEHICLE FROM BEHIND RAN INTO MY 3 WEEK OLD VEHICLE. THE ENGINE AUTOMATIC START-STOP SYNC STARTED, AND THE ENGINE RACED TO VERY HIGH RPMS. THROWING MY HEAD BACK INTO THE HEADREST AGAIN. I HAD TO PRESS REALLY HARD UPON THE BRAKES TO PREVENT MY VEHICLE FROM SLAMMING INTO THE CAR AHEAD OF ME. AT THAT MOMENT MY MIND THOUGHT OF THE TOYOTA CAMRY ACCELERATION PROBLEM YEARS AGO, AND UPON THE VEHICLE RETURNING TO NORMAL IDLE RPMS, I DOUBLE CHECKED THAT MY FOOT WAS ACTUALLY ON THE BRAKE. MY FOOT WAS ACTUALLY ON THE BRAKE.