I need help with GMC 3500 Vandura Vaccum Lines

Does anyone know where I can find a diagram of the vaccum lines for a 1986 GMC 1 ton von with a 5.7 engine? I just bought this van and almost all of the lines are broken or missing and I have no idea where they go. Any help would be appreciated. The van runs ok. I gave it a tuneup with plugs, wires, cap & roter, oil etc. but it hessitates off idle. I assume this is because of the vaccum lines? Thanks. Jim.

undr the the hood on the radiator suport there should be a vacume diagram, right there. if not there should be on in a haynes, or chilton manual