Have you cleaned the trigger points in the base of the distributor? This is the weakest point of the D-Jet, they get oily. You have low milage, but the seal IS pretty old now...

Front subframe check is easy -- look behind the shock at the "cup" on the subframe where it "meets" the body frame. If you cannot see the rubber mount in there, it's squashed. You can also check the upper mounting under the hood -- the large bolt and washer should be an inch or more down inside the oval stamping and centered. If it moves around (ie it's offset to idfferent locations every time you look at it aftrer driving), the mounts are too soft.

My 280 rides pretty high in the back, but has a trailer hitch and aftermarket shocks -- Monroes, I think (medium blue, definitely NOT Bilsteins) -- if they are 'load levelers' they are forcing the rear up. I've got some used Bilsteins (don't laugh) off eBay to put in this week, may bring it back down. Causes the rear to move more than I like at speed on curves.

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!