ok,
I am in the process of doing a single conversion on my car and noticed a line not listed on the inside of my LIM. It faces the firewall. Could someone please tell me what this is.

 

It's probably the vacuum/boost source for the fuel pressure regulator.

 

ok, here is a pic to show you...

 

yep

 

The connector goes to the ACV solenoid (air control valve, from the airpump).

The thing you have blocked off with the plate. There is two more connectors for the ACV with similar connectors. Two are black, one is white.

 

not the connecter, the vac line on the manifold

 

SurgeMonster is correct. although that's not what I use it for.

 

Yeah I just checked on my car right now as I have my LIM off, and it's going to Solenoid A on the vacuum diagram, which I believe is the pressure regulator control solenoid.

 

Quickfini is correct, I'm betting it has an orange dot on it...I'm going form memory so, tell me if I'm wrong.

 

Yup it's that one!