I need to find the cause of a slightly rough-running engine. It's
a 300SD with 220,000 mi. and a recent valve adjustment which I hoped would cure the problem. Didn't find any excessively tight valves, so I don't think there is a burnt valve. Funny thing, though is the fuel mileage seems to have gotten better with the advent of the "skip." I do not have any means of checking the compression, but have an infrared heat gun I'm going to try. The car is a Calif. model, and I can hardly see the exhaust manifold to find the cold cylinder. Another idea I guess would be to try cracking the nuts loose on the injector pump one at a time to try and find the culprit.
What I am wondering is if I get a replacement injector, what gasket, gaskets, seals, etc am I likely to need to replace?
The car needs other work, (exhaust and brakes) but I want to get the engine problem resolved before going on to those issues.
Thanks.

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Mike.