I did reuse the old ones, but they are flexible and connected. I sprayed them with carb cleaner to see if the idle would change....and it didn't . I would think if there was a leak at the ICV, then the idle would not change when I disconnect the electrical connection on the ICV.

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1995 E300 Diesel
1994 E320
1999 C230K
1994 S500 W140
1990 300 SEL