Doc, you got a couple of friends with a '90 YJ.
Mainly, the problem with these Carter/Webers (let's not drag all that out again !!) is vacuum and cleanliness. I did a total replacement of the Pulse Air system, and it worked well for a time.
I'd go with Big Jim on the warm up issue, easily. Mainly because he's done a million of these. Still, the stalling isn't really related to warm-up. It's generally the vacuum and that stupid little gum up issue.
These days, I can take my Street Princess out on the turn of the key.
Before, no way.
Pay attention, newbie. Sunder and Jim will do you right.