Ditto, adjust the rack damper bolt first. And you may need a new one. On the rear of the IP just in front of the oil canister you'll a bolt with a lock nut. You need to adjust with engine running at operating temp. 14mm lock nut, 12mm bolt. Loosen lock nut, back bolt out till a smooth idle is achieved. If you can see the color, and it's silver, replace. Not very expensive, much easier than engine mounts. Valves too, take a pic of linkage before you remove anything.

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83 SD

84 CD