92 accord has a rough idle when a/c is on . any clues to that problem. idles fine when a/c off . i know turn the a/c off duh

 

Its likely your Idle Control Valve located on your intake plenum is either dirty or bad. Otherwise your ECU would sense the load increase and increase the air moving through the valve to raise the idle a bit.

Also check your base idle speed (with the ICV unplugged) Do you have a manual? tells you how in plain english...

sohc