Checking for vacuum leaks is a good idea. Use a can of brake cleaner. In an open area with some thing to put a fire out, just in case, spray the brake cleaner on a cold running engine wherever their are potential vacuum leaks. If there is a vacuum leak the spray will cause the engine idle to increase. Do this at you own risk but that is the way I check for vacuum leaks.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas