My 84 Camry 2.0L has a vacuum actuator located at the left end of the valve cover (e.g. passenger side). If I'm not mistaken it is for the air conditioner.
I think it has to do with idle speed when the ac is turned on. (Vacuum diaphragm with white plastic hex adjustment knob and lock spring).
I did a stupid thing ...

and changed the adjustment the other day and didn't take note of where it was originally. (Hey, we all have our moments).
Anyway, does anyone have a clue how I can re-adjust this?
Thanks for not laughing (too much).