I've got a slightly bumbling 560 idle. It looks like I have leaky injector seals. I was told that my FD might be iffy too. 1 and 2 seem to misfire at idle. the injectors seem okay. It might be deceptive, but it looks pretty easy to replace. Can I do this operation myself? does any one have the procedure for it? do these fuel distributors go bad at a certain age / mileage?

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1967 250SeC
1979 450sel 6.9 (usa)
2009 S550