Ok, good to know about the coolant, since a bunch of those caps are cracking and the like.
The idle problem is that when the engine has fully warmed up (ie: after a half hour drive), if I am at idle for more than about a minute, it starts to miss a beat here and there. The problem gets worse the longer the car is idling, to the point that it has actually stalled out completely on me twice.
As for the idle jets/mix screws, no idea. I guess this weekend I'll get some canned air and carb cleaner and clean them up.
Didn't even remember we had a fuel delivery section, I'll repost this over there. Thanks for the help.
EDIT: Actually, re-reading your post and the service manual, Mikuni PHH carbs don't have chokes, and the starter system is on the top of the carb...