I just experienced this yesterday. After pulling onto a highway, my 09 Z started to hit the rev limiter @3500 MPH. I just drove it below 3500 until I stopped at a restaurant. After leaving the restaurant, it was like noting happened. I guessed it may be software related, so I hit up the Forum, looking for answers and came across this post. I guess no one has found anything definitive as yet so I guess we just keep on having fun in our Z
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