WHEN BRAKING AND TURNING, IN FORWARD OR REVERSE, ENGINE INTERMITTENTLY REVS AND PROPELS CAR. THROWING IT INTO PARK SOMEWHAT SLOWS IT DOWN, BUT I HAVE HIT A CAR I REVERSE, AND ALMOST RAN INTO A BUILDING TWO WEEKS AGO - STOPPED BY HEAVY SHRUBS LEAVING THE WHOLE FRONT END WRECKED. MECHANIC AND HYUNDAI HAVE NOT BEEN ABLE TO REPLICATE, BUT IT HAPPENS ONLY INTERMITTENTLY, MAYBE 6 TIMES IN TWO YEARS. IN PARKING LOTS, DRIVEWAY OR DRIVE THROUGH FOOD WINDOW. *LN*JB