to see if it is bad or not? I can't find my book on it, and I don't know what it should ohm out to or what the process is to go about checking it. My car idles at 1500rpms so does that mean I've got a vaccuum leak, or will retarding the timing a bit more drop it down some? The screw on the ICV is all the way in, and the screw on the TB is nearly all the way in. I never noticed that it made any difference anyway when I screwed in while the car was running.