Minkuni Carburetor question for my Subaru gurus

  Hey guys:

      I wanted to post here, as I thought it would be seen.

  In addition to my Subys collection, I have a Dodge Colt and a Plymouth Champ (79 and 81)   Both are Mitsubishi cars. Front wheel drive with the 1.6 /twin stick 8 speed tranny.

 Anyway, I am at a loss with my 81 Champ carb. I cannot get it to idle smoothly. It is a rebuilt carb, professionally rebuilt, (fresh).

Symptoms:

• Starts fine cold every time.
• Runs smoothly at idle until it warms up and choke opens and idle speed drops.
• Drives OK and has plenty of power while driving, accelerating, etc.
• Just has this erratic idle when warmed up and at idle!

There is one vacuum port on this Minkuni on the back that is sucking air when it's warmed up. If I plug it, I hear "click" and the car stalls. The car has new dist, wires, plugs, headgasket, timing belt, so it's pretty much related to the carburetor.  Oh,Compression is good and Vacuum gauge numbers looks good too.

 Does this sound like some slow jet clog, or some vacuum leak that I have not been able to locate?

    I love the  Subaru Hitachi carbs sooooooo much better!!!

  Any quick thoughts?

  Todd