NHTSA Complaint #10384634 — 2005 HYUNDAI XG350

I PURCHASED THIS 2005 XG350 IN 2007 WITH 11,600 MILES AND UNDER WARRANTY AND TODAY'S MILEAGE IS 62,600 MILES. WHEN STARTING VEHICLE TODAY HUSBAND STATED CAR SEEMED TO BE RUNNING A LITTLE ROUGH AND I SAID IT HAS BEEN LIKE THAT SINCE WE PUT THE NEW BATTERY IN DECEMBER 2010. WE DROVE 30 MILES AT AVERAGE OF 55-60 MPH WITH LITTLE STARTING OR STOPPING. AFTER TURNING INTO THE PARKING LOT WE HAD TO DRIVE ABOUT 200 FEET TO PARK. HE TOOK HIS FOOT OFF THE ACCELERATOR AND THEN STEPPED ON THE BRAKE TO STOP. THE ENGINE PROGRESSED TO 6500 RPM'S AND COULDN'T SHIFT TRANSMISSION OUT OF DRIVE, HAD BOTH FEET ON BRAKE AND THEN SMOKE STARTED COMING OUT OF HOOD. WHEN HE FELT LIKE THE BRAKES WASN'T GOING TO STOP IT HE THEN TURNED OFF THE KEY AND FRONT WHEELS CONTINUED TO ADVANCE FORWARD AND TRIED TO CLIMB THE SIDEWALK AND EVENTUALLY SHUT DOWN. AFTERWARDS HE STATED HE FELT THE ACCELERATOR PEDAL ACTUALLY MOVE UNDER HIS FOOT AND THEN TOOK HIS FOOT OFF AND PUT BOTH FEET ON THE BRAKES. WE WERE EXTREMELY SHAKENED BY THIS EVENT AND FEARFUL FOR THE RETURN DRIVE FOR OUR SAFETY AND OTHERS WE MAY ENCOUNTER. WE RETURNED HOME SAFELY WITHOUT FURTHER INCIDENT BUT VERY CONCERNED FOR OUR SAFETY IN FUTURE. THIS HAD NEVER HAPPENED BEFORE. HOWEVER I DID REPORT TWICE TO DEALERSHIP ABOUT DECELERATION PROBLEMS. OVER THE PAST 3 YEARS AFTER STARTING VEHICLE, IT HAD NO POWER TO ACCELERATE INTO TRAFFIC. FIRST TIME COULD TURN OFF CAR AND WAIT A FEW MINUTES AND THEN RESTART AND WOULD RUN FINE. SECOND TIME DROVE 1/2 MILE AND TURNED OFF CAR. WHEN RESTARTING THERE WASN'T ANY ACCELERATION POWER OVER 10 MPH HAD TO PULL OVER TURN OFF CAR 3 OR 4 TIMES BEFORE IT RAN FINE. THE 3RD TIME HAD TO TURN OFF CAR 3-4 TIMES TO GET IT TO RUN CORRECTLY. DEALERSHIP DID TAKE OUT BATTERY TO RESET THE COMPUTER TO CORRECT PROBLEM HOWEVER NOW I'M HAVING THE ACCELERATION PROBLEM THAT IS VERY SCARY. CALLED THE DEALERSHIP TO REPORT BUT IT WAS SATURDAY AFTERNOON AND THEY CLOSED AT 1PM. WILL CONTACT DEALER FOR FURTHER EXPLANATION, IF ANY. *TR