I think I have this part of my concerns fixed...traced the problem to a broken plastic piece on the throttle cable that was preventing the cable from returning to the correct stop/idle position...this was keeping the throttle microswitch open and increasing the idle speed. Replaced with a Pull-a-part part, and so far so good.

Thanks!
Ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE