Have your dealer check the "Throttle Switch". Some call it the "clutch switch". Mine was changed and it stopped the high rev on its own. Yes before it was changed mine would do just like yours "rev up on its own and even accelerate on its own". It runs like a champ now. Still hangs during shifting which forces me to shift much slower than I would like to shift. I can live with that until a reprogram if the ECU comes alone.I am confused I thought the "2 types" of high Revs was one in the same..... Mine does both "high revs1 & 2" and is starting to get really frustrating. Lately my SS's new thing is to rev up on its own and even accelerate on its own sometimes, that is not safe at all and thought there would have been a fix for this issue by now!