E320 Vacuum Leak Help
My 2005 e320 started having a rough idle about a week ago. I did sparkplugs and intake manifold gaskets but that did not fix the problem. There is no code when scanning with obd2.
Today I was able to smoke test and there was smoke coming out from some kind of valve on the left of the throttle body. Does anyone know what that is, I attached a pic..


