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I'm not sure, use the 'search' here for 'vacuum leaks' I'd say. I think you need a can of starter something (ether) and then spray it near the hose between the air box and the carb, then if the revs/sound changes considerably, it means the vacuum hose gets some false air. Take apart, clean, put back together.
Other info, when the engine is hot the idle is faster than when it's cold, so don't adjust the idle until the negine has completely warmed up.
The way you describe it, it could also be a clog in the carburator but (knock on wood) I don't have any experience with that either.
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2005 "Saturn Black", stock + tach
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