WHILE DRIVING THE ENGINE WOULD DECELERATOR THEN CUT OUT. I CAN BE ON THE HIGHWAY GOING SPEED LIMITS OF 70 OR ON A SIDE STREET GOING 30 OR UNDER. IT EVEN HAPPENED WHEN I PULLED OUT OF MY DRIVE WAY AND DROVE DOWN MY STREET (4 HOUSES DOWN) AND GOT TO MY CUL-DE-SAC AND ALL POWER SHUT DOWN. NEIGHBOR HAD TO STOP TO AVOID HITTING ME BECAUSE I WAS ROLLING AND COULD NOT STOP. ALL POWER TO STEERING WHEEL AND BRAKES WOULD BE NON OPERATIONAL. I HAVE TO MANUALLY PULL THE WHEEL TO ONE SIDE TO AVOID TRAFFIC, CAUSING AN ACCIDENT, OR FROM BEING HIT BY HEAD ON TRAFFIC. THE FIRST OCCURRENCE WAS IN FEBRUARY OF 2017 AND THE MOST RECENT WAS JANUARY 18TH ON MY WAY HOME FROM WORK. IT HAS HAPPENED TO US OVER A DOZEN TIMES AND FOUND BLOGS THAT STATE THAT HYUNDAI DENIES THAT THIS IS HAPPENING.