Got this inkl'in, that the problem is going to end up in the ECU. Yes the floor mats can and probably have done some stuck accellerator pedals. I even had that happen with my 95 Nissan Maxima.........The floor mat got pushed forward too much and when I pressed the loud pedal it didn't come back..
If people would only just turn off the ignition key under these situations, but I do know that sudden accelleration could create a panic-state where it's difficult to think clearly in a nano-second.
My vote is for the ECU...........Somewhere in it's innards, there's a little sometimes circuit that shorts, and bingo..........your electronic throttle has a mind of it's own.
