If you had a vaccum leak that was enough to cause loss of gas milage or throw CEL, would you be able to notice a change with the readings on a vac/boost guage?

 

Yes, the variance from stock boost levels would show , but it would not tell you where the leak or leaks are at. Your 2000 should under go a full stage 0 check. This would include inspecting all your vacuum lines, or as many would recommend just changing them out if they are original. Silicone vacuum hose is a popular replacement which I did on mine shortly after buying it.

 

You should be running 15-20 In Hg on your vac/boost gauge stock. So if it is lower then then 10 you got an issue.

 

Thanks guys... Ok so another question then. What are the vaccume lines used for in this vehicle and how do all of these systems still function the same when it is not under vac but under a 12psi boost during acceleration? Manual trans mind you...

 

Here's a video that may help.
http://www.ipdusa.com/product.asp?st...hStartRecord=1