I'm a genius....when I read your post I came out to the garage and grabbed my mityvac and disconnected the vac line and plugged that into the vac.....it did not hold vacuum because the other end was going into the manifold :-\ I just read your post again and thought, oooops something is wrong. So I'm in my garage now and yes, it does hold vacuum. I connected to the wrong end last night. Sorry.

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1990 190E 3.0L