Another idling problem

I have an 87 carburated accord, i've replace both fuel filters given it a full tune up and timing is fine but when i first start it up in the morning it idles fine for about 10minutes then after that the idle drops to 500-700rpm at stops and occasionally tries to stall out, at first i thought it was just a vacuum problem but was unable to find one (originally i just plugged off a vacuum line so the car would not stall out all the time like it was) does anyone have any ideas or is there a known problem area on these, I don't know much about hondas what so ever i've been a nissan/ford mechanic for quite awhile so i know the problem areas there but this has me stumped for right now.

Just an idea, is the float on your carb. set properly?

I have no idea do you know the proper way to set it, I am carb illiterate.

http://www.3geez.com/showthread.php?p=481039
go here and scroll up, it has pictures of what you're looking for.

Seems to have been fixed by doing the stage 1 vacuum removal http://www.3geez.com/showthread.php?t=11067