In my case, there's no missing. The engine sounds good and very smooth at idle (was going to do the glass of beer test, but decided to drink it instead

) There is a little nailing when cold, but think that's normal; plus there are only about 300 miles on the injectors. I heard it take a little time to "seat"/quiet down? Not sure though?
The guy down the road has the A-B light and will make sure it's right on track for timing. I agree, I don't think that's it either.
Maybe a dripping injector.......
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1987 300TD 147,000 miles- Palomino leather interior, 1995 facelift and body cladding, E350 wheels, Rebuilt suspension and sport springs, rebuilt turbo, New Monarch injection pump and injectors....and the list goes on and on...