The lower link is from Honda service bulletin, ( 90-93 accords) ,, You need Adobe reader to open the file and read it , if you Do not have Adobe reader, you can download it , it is free, ( download.com ) I want to thank our member RCY for finding and posting the link in our forum
A bit more information; THANKS to mjhenks who posted this in the General Tech section. He read thru these links that Desert posted, & wanted to add his experience...
They suggest checking the water passage on both the IAC Valve and the Fast Idle Thermal Valve. (FITV) Both of mine were "open" but i decided to check inside anyway. Good thing I did. I found that my IAC exit water port was nearly blocked and the FITV had crystallized inside its water passage. (It had a build up of mineral deposits) Once I cleaned all this out my surging idle problem went away. So I would recommend that you take the water passages apart and clean them. You will need a tri driver and some silicon to make a new seal for the IAC.
