So is this only acting like this during a warm start up? I know that I had weird issues with warm starts until I used the revised vacuum routing posted on the jet by Oscar. During cold starts it would fire up and run great, but if I ran it to the store and came out to start it, it would idle like total crap and I had to keep blipping the throttle to keep it running. Otherwise it ran great. Then I stumbled upon the thread about the revised vacuum routing and gave it a shot...worked like a charm.
Just tossing out another idea. Hope you get it running right.
..:: sleestak ::..
"Our mother of blessed accelleration, dont fail us now!" -- Elwood Blues