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napa sells a small round vacume bottle I use one in the yj and had one in my xj it fit perfect behind the battery up out of harms way. I think it was like $6
It affects idle because it's like a vacuum leak when the bottle is not on.. I technically don't know if anything else uses it. But, if you're thinking of tossing it, I would plug it or something..
If you dont replace it you wont have any AC at highway speeds because it wont have enough vacuum. I had that problem on my 89 when I bought it. They replace the bumper with an aftermarket and tossed the canister. I went a year trying to figure out the ac on mine. I finally put the canister on it off my parts jeep and it was fixed.
Mine didn't have one when I got it. The heat/ac wouldn't wswitch and no cruise. Just plugged the line running down below the battery to behind the bumper (92) and all works fine. i have got one from the pnp but never put it in because it all works.