May be a dumb questions but what is co referring to?

Also just some updated symptoms on my problem. Awhile ago maybe 4-6months this exact same thing was happening and i changed the plugs and it seemed to go away. I then went on to adjust my high idle by messing with the ICV which involved pulling a sleeve out of the housing a 1/8 of an inch or so which dropped my idle from ~1200 to ~750 but thats when the problem started with getting no power to engine again. I reversed that today and pushed the sleeve back in which raised my park idle up to ~1200 and drive idle to ~900 and it accelerates fine.

I dont really want to drive it like this as it slams into gears when you shift. Im just not sure if changing ICV was causing the acceleration problem or having a low idle was causing it. Or if it has to do with anything as i had the problem before i messed with any of that but it did seem to go away before changing plugs.