Help with running issue?

Thanks for the responses, guys! I am pretty sure the issue is not fuel related, as the car runs fine above idle. Like, if I didn't have to sit in traffic much, I don't know that I'd be worried about fixing it immediately.

As far as distributor health goes, it's has fresh bushings and the dwell isn't moving around at all. Timing is very steady, and idle vacuum is right at 21. I honestly am starting to wonder if it's a valve lash issue. These rockers have been known to close up in their own before....I wonder if they've loosened up on their own too?