How come your 1990 Nissan 240sx wont idle after turning over?

I do work as a mechanic, but I have never worked on a Nissan so I am guessing on this. You probably have the same/similar problem. I just replaced the head gasket on my car, and I can't figure out the vacuum diagram. I bought a Chilton's Repair Manual thinking it would be in there, nope. I'm guessing it's just the small hoses since you said nothing about brakes. I also have a problem with the small ones, all of the larger ones pretty much atached themselves being as how there is only a few ways they can go.