Mine does the same, I am pretty sure it has nothing to do with the ecu coding etc. I have been told some auto cars, traction control system has this thing called a butterfly effect which; when wheel traction is broken with vsc on or off the car goes into limp mode and drops all revs and restricts further throttle persistence. I think there is a ecu tune that can be done to get rid of this. Anybody know of a place that tunes new corollas?