Prelude idle issues (again)

Okay so in the last 6months here's what i've learned about my idle issues. When the engine starts up it needs time to warm up or it runs rough. Suprisingly this same "roughness" is what it does sometimes when I'm driving it. It seems to just idle down sometimes. I have adjusted idle speed and taken almost everything apart to figure this out. As far as I know all my solenoids are working properly but I have a few questions that I hope someone can answer. 1. On my intake assembly for my air housing there is a diphragm that opens and closes incoming air that is directly proportional to the air temp inside the air housing. This seems to be functioning correctly but the diaphragm doesnt hold vaccuum completely. It seems to let it out slowly and I cant figure out if it has a bleed or if it's just leaking. (None of the books say specifically, go figure) 2. And second isnt really a question but it backs up my first questions theory about this possible leak. This problem seems to happen more often in the cold weather, but like I said it is really similar to what happens if u dont let ur car warm up. Btw this is a 1984 honda prelude 1.8 with dual carbs. I have checked for vaccuum leaks at hoses and I cant find ANY!!! So if someone has a diaphragm that I mentioned above and can check to see if theirs bleeds off or holds pressure completely please let me know. Thanks.

-Bob-

Okay so I talked with a guy with a 1985 honda civic and he says his hold vaccuum completely so I'm gonna take a guess that mine is leaking. So i'll price a new one and buy it. Wish me luck ppl. Tommorow I'm gonna replace my clutch.