I have been having a few rough idling issues and last night I lost power for about 10 seconds in my engine found out later that where this hose connects on the bottom was completely broken loose I need a new one and need to figure out what this hose is?

 

That's a fairly common occurrence on these cars, they start off as a pliant rubber and after years of heat turn into a fragile plastic/rubber.

That's the intake hose, we have them in stock ready to ship.

Give us a call if you are in need of assistance.

 

It'll be #10 in this diagram, in case you needed the OEM part number.

http://www.realoem.com/bmw/enUS/show...12#13717555784