I know it has to be a vaccum line, but which ones control it? I've had the heads and intake off as well as a bigger cam installed..... Is it lines on the intake that control that?

 

its a little 2 way checkvalve near the AC by the PCM...look for 3 vacume lines goin into a little ball lookin thing.

U can get one at NAPA for 2.99.

Marcin

 

Already had this written up:

An easy way to tell what part of the system may have trouble is to go to the vacuum check valve and test the lines back to the mode selector and to the vacuum canister. If you have a hand held vacuum pump, it would be pretty easy. What you would want to do is remove the hoses one at a time and apply vacuum to each and see if it holds. The line to the intake manifold will have to be removed at the manifold and plugged back toward the check valve for you to test the line for leaks. You can test the check valve, too. Sometimes it is the cause of a leak.

If you find a leak on a particular hose, you will have to trace out the cause on that section.

 

If I put on the the vaccum hoses on backwards on the intake would it do that also?