The vac lines are all the rubber hoses that don't carry coolant. Seriously thought, look at the driver side firewall just left of the brake booster, you will see a "tree" with 4 or 5 lines coming off of it. one goes to the brake booster (if you don't know what that is I think this is all pointless), another to the intake, on to hvac crap etc etc. Follow all of those lines and inspect EVERY one of them. I would guess your evap canister/solenoid lines are the most degraded (most cars I find those are the worst). The charcoal/evap canister is on the pass side frame rail down by the air pump (just beside radiator but on the actual rail...hope that makes sense. You have a lot of vac lines that come off the underside of the intake. They go to the pcv, fuel regulator and emissions crap. Check all of those too. Some of them will be plastic and very brittle. Go to your local parts store and buy 10-20 foot of 1/4 inch vac hose (should work, can't remember as I've not jacked with stock lines in a long time) and some 3/8 vac line to redo all that you see.