I drive a 1990 Crx hf gsr swapped. My car has a hard up and down idle. I've cleaned the iacv, fitv, and bled the coolant system. I started to think it was a vacuum leak, there's a vacuum line that comes off the top left of my stock gsr intake mani. When I hold my finger over one end the idle isn't as rough. Anyone know where this vacuum line goes? I have pics just don't know how to upload them. Any other possibilities that could be causing this? All help will be greatly appreciated thanks in advance

 

If that hose isn't connected to something it likely your issue.

When you say the hoses/line on the left, do you mean driver side or passenger side?

There are 4 vacuum lines to hook up to the intake manifold.

look here for routing:

http://site.hamotorsports.com/b18c1-vacuum-diagram

Do you still have the charcoal cannister? If you removed it you'll need to cap those lines off. look for some vacuum hose caps: http://shop.advanceautoparts.com/wcs...8_pri_detl.jpg