Quote Originally Posted by dn010 View Post
A small leak won't do much but a large leak can cause problems. The vacuum hard line going down the frame to the front of my car had rusted out and caused all kinds of issues I could not figure out until I went to change frames. You can pull the hose off the main vac nipple on the back passenger side of the intake, plug the nipple and see if that changes anything. The rest should be easy to inspect, check the lines for cracks, follow them and make sure they're connected, etc. You may or may not find something, but at least you can check that off your list and keep going without having to spend any money or much time on it if you find nothing wrong.

I'll give this a go tonight-- thanks!