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check vacuum first. don't spray the rubber hoses just spray onto a metal part of the carbs next to the hoses. they are silicone and are meant to be chemical resistant so its fine if you spray them by accident. just don't soak them in acetone. if there is a vacuum leak it will breath in the fumes from the spray and make the rpm change. if you have a vacuum leak then your slides wont be opening enough which means you wont be letting enough fuel into the stream for what the engine needs.
if you have no vacuum leak, and you don't have a torn diaphram, and you have an unobstructed intake, then i would assume either the main jets clogged or the needle is stuck or something.
if it was truly rich, you would get a rich bog when opening throttle. as in the rpms go down. opening throttle from idle and having it slowly go up is probably lean.
it's also possible that you have lost compression due to a variety of issues. it would also cause the same symptoms.
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