I concur with dzeiler. I bought a Hosetechnique silicone vacuum hose kit and replaced all the vacuum hoses. You can search for a hose that's leaking right now and replace it. But down the line another hose might start leaking and you will have to go back and do the leak test all over again. Much easier to replace all the hoses with silicone ones, tighten them properly and never have to worry about them again.
-Rudy
VR RX-7 TT
Blk/Blk Supra TT