TL*THE CONTACT OWNS A 2006 MERCEDES BENZ S430. THE CONTACT WAS DRIVING APPROXIMATELY 60 MPH. A SUDDEN INCREASE IN ACCELERATION OCCURRED WITHOUT WARNING. THE VEHICLE SLOWED DOWN AFTER SEVERAL ATTEMPTS. THE VEHICLE WAS TAKEN TO AN AUTHORIZED DEALER FOR INSPECTION. THE TECHNICIAN STATED THAT THE DEFECT COULD POSSIBLY BE TRANSMISSION GEAR FAILURE. CURRENTLY, THE VEHICLE IS UNDER INVESTIGATION BY THE MANUFACTURERS ENGINEERS. THE CAUSE OF FAILURE HAS NOT BEEN DETERMINED AT THIS TIME. THE FAILURE MILEAGE WAS 113,000. UPDATED 04/16/10. *LJ UPDATED 4/23/10 *CN THE CONSUMER STATED HIS WIFE HAD AN ACCIDENT IN THE VEHICLE. THE DEALERSHIP ADMITTED THERE WAS AN ACCELERATION AND HARSH SHIFTING PROBLEM. UPDATED 05/12/10.*JB UPDATED 06/24/10.*JB UPDATED 09/07/10*JB