So my OM602 in the 300D has been misbehaving in the mornings.

It'll start up fine and then a few seconds into running it will start to miss:

Here is a video, its not as bad as it has been but you can see get an idea of whats going on.
https://www.youtube.com/watch?v=_uRKNe0ZMM8

Any thoughts on a cause?

I've recently re-done my delivery valve seals and replaced the #4 and #5 injector hard lines. The problem existed before all of this work and still exists after.

I have about 293K miles on it. Injectors are original and are slated to have their nozzles replaced, tested and balanced by greazzer when I have my 190E's water leak resolved.

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82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k