Ok I have read everything I possibly can find relating to idle issues and I'm stumped. Here's the situation...

The odd idle occurs only when cold and when the car is first started. Idle runs up to about 2500 rpms and will drop back to the 2000 range and then oscillate between 1800 and 2k until it warms up. The idle will only seem to oscillate when the clutch is let out and the car is put in neutral (or after coming to a stop after driving before it is warmed up). Once the car hits normal opperating temperature it idles perfect.

Here is what has been done:

1) Throttle body has been cleaned thoroughly.
2) BISS has new 0-ring
3) ISC checks out fine
4) Disabled the egr valve (pulled the vacuum lines and capped them)
5) Can't find any vacuum leaks.

One other point of interest. Even after the car is warm I can reproduce the surge by backing out the idle screw so that it idles at 1500ish.

I'm really running out of ideas at this point so any suggestions are appreciated.

Thanks in advance for the help,

Gary