i'd do another valve adjustment; when i first got my 300SD it would shake bad at idle when warm. it got better after each valve adjustment and now is almost totally gone. i even did an adjustment with a warm engine (using warm engine specs), that really improved the idle. i found that most intake valves were tight even after 100 miles. you might even want to do a cold engine valve adj. and leave the valves a little loose (use the warm specs: .40 on exhaust and .15 intake i believe but double check)