I'd place my money on electrical. The throttle assembly tells the pcm it's at WOT and off to the races. Every part malfunctions. IMO where Toyota dropped the ball was having a back up plan. Most manufacturers have a safety net that won't allow throttle and brake at the same time. At least not above a certain speed. I read they are updating the PCM's to do exactly that, any brake input above say 30mph automatically cut's the throttle to idle.
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Todd
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