We have a 2003 Murano. On a recent trip to Florida, we started experiencing what I'll call "rpm twitching". While maintaining a consistent speed between 75-80, both manually and with cruise control, the tach would jump up & down between 2200 and 2700 rpm. It was an intermittent problem while cruising the interstate during the trip. This hasn't happened since we returned home due to city driving, but we took it to the dealership anyway to have it checked out. Of course, the computer said everything was fine, but the problem wasn't our imagination over 1600 miles of interstate driving. Has anyone else ever had/heard of this problem? Any help would be greatly appreciated.