Hi everyone. I am Have a problem with the C.C. I have a 92 sc400 with a 97 sc400 motor(bought it like that). the motor is the stock v8.

The Problem
When Im driving down the freeway, I set it at around 75mph. it sets but then it punches it on its own, then slowes down to 70 then it punches the throttle again. It doesnt stop till I turn it off, and it will keep doing this with out any pauses.

Any thougts to what the problem could be. Thanks for taking your time to look and help.

future upgrade. 1jz