Any vacuum leak related to the engine will often cause a high idle condition. I had one on my 450SEL and sealed it at the vac hose juncture with Red gasket sealer; the idle dropped to normal immediately. The vac door lock system would not normally create high idle -- since it is activated by a separate vac storage system that should have a check valve in it, but if the lock vac leak does have a DIRECT connection somehow to the engine vacuum systems, it could cause idle problems. Check all the vacs and seal them or replace the hoses...... BC

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Ben Harrison Carter
1999 Mercedes ML320 87K
1992 Mercedes 300CE 89K
1995 Corvette 29K -- Sold Dec 09
1989 Mercedes 420SEL 99K -- (Sold 4/08)
1968 Mercedes 230S (106K) (Sold 9/06))
1976 Mercedes 450SEL 130K (Just sold - 06)
1961 Mercedes 220Sb (sold years ago)