I have a 1986 325es manual. It started having the accelerator stick. It was accelerate on its own. I was able to get it home and get it into gear. When I put the clutch in it rpms at 3500!!!! It won't go back down. I have checked the throttle cable also. What could this be? Idle Control Valve near the intake cover? Or I have heard Idle Control Unit that is controlled by a stabilizer near the glove box....in a green box....? PLEASE HELP!!!!