Just picked up a 1991 Ram 4x4, 318 for my son. Not too bad for 1k with 135k on her. 4in sus lift, fitted with 35's. But there are alot of vacuum line plugged or sitting free.

Any where to find a diagram of the lines?

 

Got any pics?

 

There is usually a sticker under the hood for the vacuum line routing. 88-91 had the same vacuum line setup if your sticker is missing. Haynes manual #30040 (912) has the diagram in it. Chiltons manual #8166 also has it. If my scanner worked I would post it . Sorry.