OK, did some more investigating after work tonight. I also replaced all the small vacuum hoses on the intake side of the engine. No change.
What I did find, however, was that it is cylinders 3 and 5 misfiring every time. I did the old "pull the wire off the distributor and see if the idle changes" trick, and I can remove both of those wires with no change at all in the idle.
Thoughts? What would connect these 2 cylinders?
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