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The throttle shafts in the base plate or the bores they run in (more likely) may be worn not allowing the throttle plates to fully seal in the bores. Some carb shops can rebush the baseplate and or replace the shafts. If you want to check it, remove the base plate and check it against a light source (or wiggle the shaft) while it's installed on the car. If you can feel movement you have excess clearance and a source for a vacuum leak which will raise the idle speed.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 04-23-2008 at 06:50 PM..
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