I've experienced EXACTLY what you have been talkin' about in my '95 MB E420...I've never been able to pinpoint the problem though...and it went away after my last service check...I always assumed that it idled rough because I don't drive the E420 very much...but when I was readin' through this forum, somebody else w/ a E420/400E experienced the same problem too...tell me if you have any luck!

------------------
-= 1995 Mercedes-Benz E420 (W124 - Black Pearl/Black) =-