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Well, adding an update for posterity. Ended up taking it over to Dan Martin in Gaithersburg. He confirmed there were some misfire codes with cylinder 6 (though no engine light or codes on my reader). He dropped some MMO in the cylinder and let it sit over the weekend and then blasted out the cylinder with compressed air to loosen up any carbon that may have stuck around the valves...it seems to have remedied the problem. I havent picked it up yet, but Dan tells me the idle has returned to smooth running.
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