Simple Vacuum Leak Fix
I'm starting a thread for this just because vacuum leak threads are all over the place and I wanted this one to help all of them.
So I've had a bit of the rough idle when warm problem, and I went on a CCV and Vacuum leak hunt this afternoon.
CCV's were perfect so I took off the intake to look inside the throttle body to see if there was any oil in there that would suggest a vacuum problem elsewhere. (it was dry... whew) but I did find a leak. Stupid leak that everyone should check for if they are having issues.
Turns ou the main air duct from the filter box & MAF to the throttle body is held on by two 4" diameter hose clamps. Very nice BMW ones. The air duct has a groove in it to receive these but what the previous mechanic hadn't noticed was that there are little pockets in the rubber duct for the screw mechanisms.
If you don't orient the clamps properly, you create a small gap where air can creep by. Especially if they didn't tighten these hard.
Anyway, seems to have cured my problem. Hopefully all problems would be as easy. Not likely, but I thought I'd share in case it saves someone some time gremlin hunting.
(Sorry for the duplicate... wouldn't let me delete the other one)