Originally posted by rs4pro3
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The black "thing" is the injector and the other pipe collects vacuum

Here you see two connections that come off the main vacuum collector pipe. There is one more at the back which I think goes to the brake booster.

On my M3 CSL I find that the engine hunts during idle only when the air condition is switched on. I don't remember if that was also the case with my M3.
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