Thanks for the advice, Coyote X.
On the plugs/distributor/wires: This was my first thought, and I replaced it all last week. It got rid of a now-and-then miss, but the sputtering/chugging is still there.
On the vacuum hoses: Some of 'em looked shaky, so I replaced pretty much every hose that was in there and made sure they were all sealed up tight. No change, but there does look to be a "lead" where a hose should go that has nothing attached to it. Mr. Haynes has been trying to help me figure out wtf it's for, but he seems to have no idea. It's back behind the airbox closer to the passenger side of the car, pretty low in the engine compartment. It's not coming out of the engine, but rather the (firewall?) Haynes doesn't seem to have any pictures of it, and I'll try to snap one when it gets light out (40 degrees dark and rainy @ 5:30am right now)
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