ZC acting up????

I have a zc swap in a 89 lx and it idles like it reves up to 1500rpm and then drops to 500rpm. It is really annoying and i was just wondering if anyone knew what it was? Also how can i tell that there is a new clutch installed?

Also the idle problem is constant. it doesnt stop when it gets warm or anything.

clean out the electronic air control valve and make sure you dont have any vacuum leaks.
http://www.binghamtonlife.com/manual/2gsm/images/91-11-75.jpg

Mine did the same thing. I got a new PCV valve and that fixed it.