im not sure if i have a leak, 4wd, hvac and cruise all work fine. but i have a revving problem during startup and was advised to see if any lines are brittle/ leaking, i just had a few replaced mostly on the drivers side of the engine, i know theres some under the battery tray,

also what size lines do i need?

 

I would love to see a full vacuum diagram as well anybody know of a good place to find one?

 

If your HVAC and 4WD work, then it's unlikely you have vacuum leaks. And FWIW, vacuum has nothing to do with cruise control.

If you want to look at the vacuum lines, check out this page and look at the links for transfer case switches and 4x4 troubleshooting. The vacuum diagrams for the 1996 Sonoma and the 2004 Blazer are the same, except the vacuum reservoir is located inside the fender well for the newer vehicles (including your 2000).

 

I would also like to see one of those. The guy who I bought my 2000 Blazer off of changed the engine and failed to connect about a half dozen hoses. It'd be nice to know where they all go.

 

I have the same problem. Before I bought the Jimmy they had put a new Manifold Gasket installed. Now I have found a vacuum hose without a home. I have a whistling sound coming from underneath the pass/side. The hose has a collar on it