Here's a list of things that I have done or had done to the car:

Shop:
new glowplugs
bench tested all injectors, replaced #1 because of unsatisfactory spray pattern, other 4 were good
valve adjustment

myself:
restored stock fuel system configuration - diesel only
all clear fuel hoses to see air - small leaks but no major bubbles
installed pressure gauge between fuel filter and IP - around 6-8 psi fuel pressure
changed fuel and air filters
inspected fuel screen in tank - ok
drained tank and filled with fresh diesel (not full, around 2-3 gallons)
changed hand primer pump on lift pump
removed and cleaned lift pump (before fuel pressure reading above)
inspected and cleaned IP overflow valve - ok

This engine is fairly new, it is a 3 year old factory replacement engine, installed by PO (I have the car since Jul. 2004). It's been leaking some oil into the driveway as a testimony to poor installation and the engine oil had gotten alarmingly low at some point before I noticed it. The oil pressure was always ok, though.

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84 300SD with Greasecar vegetable oil kit. Boston, MA