Ford Repair: vacuum lines, vacuum lines, vacuum manifold

Question
1991 Ford Ranger 3.0L V-6, Auto Trans, Air
I replaced the valve cover gaskets on my engine. My intake manifold has a small vacuum manifold with (7) hose connections. I can only find (6) of my vacuum lines. The truck starts up fine but it starts to miss over 2K rpm. (I capped off the spiggot that needed  the missing line). My Ford dealer showed me diagrams, but they only show (6) lines.Any suggestions? I went to the Autozone help pages, but there diagrams only show (6) lines. My Chilton manual doesn't show me anything.

Answer
Hello and thanks for the question...I'll try to help.
I just took a look at the autozone site. It doesn't seem to be complete. I can suggest one of two things to help you. First, retrace all of your removal steps, and locate the vac line that's missing. Silly I know, but it happens, even to us mechanics.
Second is go to a site called Alldata, and buy in to their service for your vehicle. Alldata, is the automotive leader in information service.............it's the BEST. I think for a single vehicle, it costs about 25-30 bucks for a year.
Hope this helps,
Erik