The rack damper bolt doesn't have anything directly to do with idle speed.

As suggested by The Gears this behaviour can simply happen due to poorly lubricated throttle linkages.

Idle speed is controlled by the governor inside the injection pump. Wear inside the governor can cause idle speed to remain high a bit longer than it should, when the throttle is released. The governor is not adjustable.

Also, it is not particularly unusual for the idle to remain a bit high immediately after you exit the highway. Also some cars idle roughly for a minute or so, after extended highway use.

Goldveg, from your user handle I assume you are running vegoil. It would be helpful to know if you are starting and shutting down on diesel, then switching to veg, or....? Alternative fuels complicate some issues.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22