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Are you driving two-footed? ie, one foot on the brake and one on the gas? Because using the brake pedal will cut out the accelerator (a safety feature that was in place BEFORE Toyota had their issues with runaway accelerators) You can try it at any speed, lightly press the brake and try to accelerate at the same time and it should not work.
If not, then there is a bulletin that documents replacing the connector at the throttle body, and splicing in new wire ends, staggering the splices so they are not all at the same distance from the connector.
You may also want to take it to the dealer, and go on a road test with the shop foreman or one of the techs, if you are able to demonstrate it they may have a better idea of what is causing it, if it is indeed an issue with the brake and accelerator receiving a signal at the same time. Best time to go in is around 10 am, after the initial morning rush but before lunch.