Have you cleaned the throttle body yet? Take it off and spray a solvent such as carb cleaner into it, both sides, with the body in the opened and closed position. Allow the solvent to evaporate or otherwise dry then replace.
The other possibility is that you have a vaccum leak near where the throttle body is. However, here is my question to confirm this. Is the idle only settled the first time that you spary the throttle body? Or is it calm for the next start or next day as well. If not I would check for vaccum leaks as well as cleaning the throttle body.
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