[rpmerf]

Runs the same with the air filter off. I haven't gone around the block with it off, but idling in the driveway, it sounds the same and the wideband reports the same.

I poked around in the distributor at some point. I think the day after it was running bad before. Everything looked to be in order. I set the dwell about a month ago. If it's still running bad when I get off work, I'll hook up the dwell meter and the timing light just to be sure everything is in order. I'll poke around in there again. Use a vacuum pump on the vacuum advance to be sure it all looks like it is moving correctly.