If you are pretty sure that it is a vacuum leak still, try this. Get a can of starter fluid and where there is a vacuum connection and while the engine is running spray the starter fluid lightly on the connection. If the idle increases, then that is where the leak is. Take caution doing this, as the starter fluid is highly flammable. Do it in a well ventilated area and have a fire extinguisher on hand. This is a common practice to troubleshoot vacuum leaks, but just be cautious. Start first around the base of the intake where there is no hose connection.
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BMW Z4
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