have the same prob with my 190D. except that it feels like something is tugging the steering wheel sometimes left, sometimes to the right. Had the alignment checked twice (no probs there). It got a little better after relacement of an idler arm bushing, front struts, and new tires, but it's still there. The mech has now clue what it may be. Front end is a little loose, but nothing needs to be replaced. Basically, I just ignore it, but car does not track on the road as solid as when I bought it. Bummer...
1985 190D 2.2l Sold-to Brother-in-law
1996 Mustang 3.8l -"thinks it's a sports car"
1988 Grand Wagoneer - Sold (good home)
1995 Grand Cherokee Ltd -"What was I thinking??!!"