I don't think that the little bit of extra air you are getting around the throttle shaft is your problem. The small amount of extra air can be covered up by enriching your idle mixture. Installing bushings in a carburetor base plate is not something that is done in a regular kit install. The removal of the throttle plates and shaft are kind of a pain as the screws that hold the blades to the shaft are not meant to ever be removed. Usually a special tool kit with specific reamers is required for the install of bushings also. Your average shop today that is used to fuel injected cars will probably not have this equipment. I would say that you have an idle circuit problem such as a plugged passage or a vacuum leak somewhere else.
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