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The ISV does get clogged up w/ oily deposits, you can clean it w/ brake cleaner, be sure that the inner flap rotates freely. You can apply a low voltage signal to the contacts to see if the flap rotates but the usual issue w/ these after many miles and years(besides clogging) is that the internal electical contacts wear out around the correct normal idle position.
The only cure that I know of is to replace the ISV.
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