Ok – Thank you very much for your advice! It was indeed a coil!
I picked one up at a scrap yard for $10, and drove the van around this morning until the misfire occurred again.
Got out and pulled off the power plug to each one, and found the one that wasn’t working. Swapped it out with the one I had, and have driven it about 2 hours now, with no further problems!
I did get another code, after driving the van quite a bit (p0431), but since it seems to be emissions related, is it something to worry about? We don’t have vehicle inspections in Indiana.