2002 Mercury Cougar Q&A
2002 Mercury Cougar Question: Why does my car rev high when I set cruise control and go on a slight incline?
When you set the cruise control the vehicle is trying to maintain the seed in which you set the cruise so when you go up an incline it want to go the spped you set it at but it needs more power to get up the hill. So the only thing the car can do is increse engine output to maintain the speed. - gmc4me
scan for any codes to start with - globalhelper