Aye Roll is right, I think you may have misunderstood the reference to using carburetor cleaner. It is the throttle body which gets dirty and he was recommending cleaning it with the carb cleaner. I can testify that it help the idle greatly. Don't get the cleaner in the throttle position switch, however. There is a spray cleaner called throttle body cleaner which is supposed to be better than carb cleaner.

I can also suggest that you clean the Idle Air Valve. The IAV gets dirty and sticky. While you have the throttle body off for cleaning, you will have a clear view of the IAV to remove and clean it. Use carb cleaner.