My WRX started having problems with the RPM's rising to 3000 everytime I stop at a redlight a few month's ago. I've had the computer remapped , the fuel injection system and throttle body cleaned. The problem still exist if I drive and stop in town for to long. I have even tried spraying the throttle and cruise control cables the cruise one is a little stiff no play in the cable. Any ideas or suggestions before I have to take it back to my dealership and pay more $$$ ?