How's it going all. I'm a newbie to Mercedes, but not to diesels. I currently own a '91 f350 7.3 IDI. There's a '90 300D w/ 2.5 turbo for sale near me and I'm interested in it. It has 215K on it, and the body is pretty good. I've taken it for a ride, and it rides nice, but at idle it vibrates like hell. It idles at 600 rpm, and it's real rough. But once it's up to 1000 rpm it smooths out nice. The guy is asking 3500 for it, which I think is a little high. Is the vibrating and rough idle ared flag, or something common, or easy fix. One more thing--how expensive is it for parts for these? I appreciate the help. Thanks.