My 85 300D, which is well maintained, shudders and throbs, when I apply the brakes to stop it at a Red Light and the Automatic Transmisson is in "D" position. The shuddering/throbbing seems to come from somewhere in the Exhaust System, believe it or not. Other ideas I am thinking that cause it may be the Pilot Shaft being Loose, Transmission misadjustment, Transmission or Engine mounts...

The shuddreing throbbing goes awy when I place the gear selector in "N" vice "D".

I will put the car on JackStands this week to do a full investigation, but does anyone have any ideas?