I'm having trouble identifying a vacuum hose. No, I don't have any pics, but it is a small 2-3" rubber hose that attaches to the front pass. side of the intake manifold & connects to a semi-rigid hose that runs along the side & down the back of the manifold. Anyone have any idea what hose I'm talking about? Any pics.

 

OK Figured it out. It is the PCV hose. The hose connects a nipple on the manifold to the main hose. Got pice of hose from AZ & they read the SES codes. Turns out the rough idle was a loose spark plug wire from when I changed the plugs a few weeks back. She's back to normal no more SES