Help I'm lost as to where it goes the only think on the rear of the motor is what appears to be the oil pressure sensor I have felt around it and can not feel any vacuum ports used mirrors and hands but can not feel or see any ports on the back side of the kegger.
I have followed all the vacuum lines in the engine bay and there are not any that have a stub to attach a line
I said what the heck and fired it up, it ran great as long as I gave it gas but would not idle on it's own so I guess it has to go somewhere unless I screwed up a sensor when I was cleaning the tb.

 

Ok, I hope this helps:
This is the left -upper side of the firewall. The connection on the left goes to the vacuum reservior; the next one goes through the firewall to the climate control system. If you continue to follow the line to the right, it connects to the main vacuum line. There's a heater hose and some spark plug cables running under the vacuum line.


This pic shows the left side of the kegger (left side, facing the engine). It makes a 90 degree turn and heads to the rear of the engine. Right after the 90 is a Y connection that connects to the cruise control. The Y is just before the red fuel injectors in the back ground. The main vacuum line continues over the fuel injectors.




At the very top of this pic is the connection for the 4x4. It's plugged into the end of the main vacuum line. The connection that goes off to the left is the line pictured in the first photo. There should be three connections there: the main vacuum line, the line leading to the reservior and climate control and the line leading to the 4x4.

It's a little hard to tell the 4x4 line should be connected there because it looks like it just connects to the other line.
As far as the idle, it's bad because air is just getting sucked through the line into the intake instead of the vacuum line being capped by the 4x4 line.
I hope this helps.

 

James thanks for the pics I was wondering if you could give me a shot thats not zoomed in so much a little wider shot maybe especially the last one the white tube in it is the 1 I am talking about
I propped the accelerator pedal so she ran at 1000 rpms for 15 minutes or so while I shot starter fluid around my intake and vacuum lines there was no surging and when I was done it idled fine
Thanks Randy

 

Ok, I did the best I could. If I back up too much it just looks like a bunch of wires. I put a piece of red tape on what I'm calling the main vacuum line. The line with white tape connects to the reservior and AC. The white line runs straight down.

This is what it looks like with the 4x4 line disconnected.



This is looking straight down on the engine. Kegger on right, valve cover on left. The air intake tube running across the bottom. The main vacuum line has the elbow going into the kegger, runs under the breather line (larger hose that goes from air hat to valve cover) runs under the spark plg wires, then the red tape, then goes to the 4x4.

 

James thanks for all of your help I think the po had the gasket replaced because when I pulled the keg I had rtv on the top and bottom (running the whole length not just on the corners) of both the front and rear rubber gaskets of the intake' my plenum gasket looked to be in perfect shape, there was a light coating of oil inside the kegger so I think it was just starting to leak again. When they did it they must of lost the small vacuum line or broke the tee fitting because where yours is I have a regular rubber vacuum line running down the back of the motor and I do not see 1 on yours. Everything seems to be running fine now and I am not getting any codes
Thanks to all Randy

 

I'm glad it's running better and no codes. Does it go in and out of 4x4 ok?

 

I have not tried yet its running ok wont idle when its cold but does when its warmed up just really low rpm 5-600 a little surging, raining today so was going to have 1 last go at trying to find a vacuum port. going to pull the tb and clean it up again pull all of the sensors and see if something is blocked if not get a new IAC I am waiting on my super chips tuner before I take it out too much