Update: Dirty injectors were the cause of the misfire...

Injector O rings solved a lot of the vacuum leak, but not all of it. I ordered the wrong injector seals so had to pull the injectors twice. Now that the injectors have the correct seals, (rather than the old hard ones) my vacuum leak has increased back to where it was.. drat!

Do the white nylon (mine are yellow now) injector holders shrink or warp in a way that can be a source of vacuum loss?

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'83 240D
'85 300D
'86 300SDL
'88 300E