I have a 1994 Integra with 223,000 miles....

It has had a cold idle rapid fluctuation at startup for over 2 years.

It was getting worse and worse so I finally addressed the problem..

After several of the trouble shooter things like radiator vaccum and "leaks" in
the vacuum lines we decided to buy the "fast idle control" (Part #
16500-P0A-A51) for $80.00 and so far .....one week of cold starts.....THE
FLUCTUATION HAS STOPPED!!!!!!

Hopefully this was it but until it gets really cold.....I will keep my fingers
crossed!

Neil