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idles up to almost 3000 rpm at times

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    idles up to almost 3000 rpm at times

    This is on an 87 325is. When I disconnect the icv it ramps up to 2000 rpm and the icv hums when the key is on. I cannot see any vacuum leaks and spraying wd 40 around the hoses does not cause any change. Any suggestions? Thanks
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