rough idle on a 1995 540i

[mislead]

My car idles rough during the cold, and after driving it for a while it idles great. accelerates good, just a rough idle. Sometimes it will bog when cold when first accelerating. I have no check engine light. My iac looks clean. Spark plugs are good. Any ideas what could cause this?
thanks,
Ben

[e34.535i.sport]

Vacuum leak maybe? I'm thinking I have one at the moment as my idle is enough to rumble you around a bit in your seat but it drives great. Will be inspecting very shortly...

[MBXB]

Check out the archives under the Maintenance or Engine sections.
Intake or vacuum leak is most likely.