Thanks all. The car has not been modified, (yet). I was In D, just crawling behind someone who wanted to take the entire Commanarra Parkway, (Sydney Street), at 45-55km/hr. Yawn. Car was at around 1500 before it spiked. There are a lot of ups, downs, twists and turns in the part of the street I was on. It surprised me as ive never really experienced it before. Perhaps it was just slowing down for me? Not a cruise issue, it wasn't even on. Thanks for the suggestions and I'll check the thread to see if anyone has any others.