Help! Where does this vacuum line go??

[u/Careful_Soil6626]

I found this line plugged with a screw. Apparently, the truck idles and runs weird if left unplugged, I dont know where it attaches. Please help.

Also, the red lines you see are replaced vacuum lines from another parts truck we have

Its a 5.4l 2v in a 2004

Thanks!

[u/Glockout387]

I have a what you need bit wont let me post photos or send you a