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idle: check to make sure that the throttle is not sticking slightly open.If that checks out spray carb cleaner over ALL the vacuum lines in the engine.If idle changes as your doing that you found a vacuum leak.Replace that hose,then continue on down the line until you have no vacuum leaks.
if fixing all the vacuum leaks doesn't fix your problem, Post a new thread in old gen subaru forum asking about how to tune the carb.