I think you should check the simple things first. Don't start pulling the valve cover to adjust, valves or check timing until you have identified the simpler things.

IE: Checking the throttle linkage, Changing both fuel filters, Checking the fuel lines (all of them) for fuel/air leaks, Checking the lines and banjo bolts to the ALDA system and checking all the vacuum lines under the hood.

Once these have been done, start looking at the tank screen, primer pump, valves, compression, turbo, timing and other things.

You will probably find it is a simple problem if the car actually starts and runs good otherwise.

FYI... When I picked up my car the throttle was only seeing about 50% at the IP at WOT in the pedal. Both banjo's with the ALDA were clogged. One with EGR goo and the other with soot. There were several air/fuel leaks and the vacuum system was not in the greatest shape. After repairing these simple things the car ran much better and would fly by comparrison.

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AJ

1985 300D (SOLD)