Wow, a 3000 rmp idle is high!

Check your throttle linkage. Make sure it's not binding on anything. You can spray some silicone spray into the cable to keep it moving good. Lightly lubricate all your throttle linkages while you are it.

You can also tell by looking in the throttle body at the butterfly valve. Make sure it is closed with no carbon build up around it. With the engine off, you can have an assistant press the gas pedal while you look at the butterfly valve open. If its dirty, spray a little carb cleaner and clean around the opening with an old toothbrush. Remember, spray only a little at a time. Also check the idle adjustment screw, try backing it off to see if that helps.

One other thing is to check for vacuum leaks.