I know this is probably a can of worms and the idle is electronically controlled but you guys are pretty damn smart so maybe you have an easy solution.

Car starts and runs great but will fairly consistently drop to a low lumpy idle after it reaches operating temp. Only does it under load though, if its in neutral it will hold around 650-700. I replaced the plugs and wires yesterday and while I did clean up the contacts on the dist. cap, that component is well used. Would that be enough to offset the idle?

Starting to like this car.

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1981 300TD
2005 C55
2004 E500
1999 ML430
1992 400E
1998 C43
2001 SL500
1988 300SEL
1986 190E 16V
1991 190E 2.6