Hey guys,
My car started to idle roughly yesterday, I checked under the hood and realized a vacuum valve was disconnected, but I can't for the life of me figure out where it connects to! Any ideas would be much appreciated. Kinda gotta be somewhere tonight with it!

Car is an NA Fairlane, if that makes any difference.

Here is a picture:

 

 

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Map sensor most likely

Going by the size of that hose, looks like the hose for the MAP sensor....just behind it on the firewall.
Make sure the bottom of that hose doesn't have a crack/tear in it where it goes on a hose fitting into the intake manifold.....they are prone to this.

Thanks so much guys! That was indeed where it connected! I don't know how I missed it.
Bottom of the hose is okay too cjk, thanks for the tip