These are exactly the issues I was having. I also had an occasional stalling issue that would go away for a while, but as the computer learned, it came back
Get the TB Idle Airflow first. This will help get your idle down to where you want it.
Then work on the ISC Neutral Idle airflow for the surging and the dashpot preposition to help if you have a stalling issue.
The idle screw is supposed to be set by backing it all the way out, and then turning it back down until it touches, and one full turn more. You also have a screw that allows air to bypass the ISC/IAC. You can use this for more air if need be. You can also go more on the idle set screw, but the preferred method is one turn past contact. The idea is to keep the IAC/ISC duty at around 34% at idle....
At least this is how I understand it...
Someone else chime in...
All of this in on
http://tweecer.oplnk.net/ if you search long enough. It's also in Clint's EEC Analyzer program.....
Dennis