2010 LEXUS LX Vehicle Speed Control Problems

WHILE DRIVING BACK TO THE BAY AREA FROM TAHOE, OUR LX570 CONTINUED TO ACCELERATE ON THE FREEWAY EVEN THOUGH ALL PRESSURE TO THE ACCELERATOR WAS LIFTED. I PULLED UP ON THE ACCELERATOR AND ADJUSTED THE FLOOR MATS TO MAKE SURE NOTHING WAS RESTING ON THE ACCELERATOR TO NOT AVAIL. A FEW MOMENTS LATER AFTER APPLYING PRESSURE TO THE BREAK WHILE ACCELERATING, THE ACCELERATION SUBSIDED. I BROUGHT THE VEHICLE INTO LEXUS OF MARIN FOR INSPECTION BUT WAS TOLD THAT THEY HAD NO REPORTED INCIDENTS WITH THE LX570 ACCELERATORS AND THAT THE VEHICLE WAS OPERATING WITHIN LEXUS SPECIFICATIONS. *TR