thanks for all the replies!

I replaced the glow plugs and reamed the holes yesterday, and im getting 12.5V at on each pin at the gp relay. I replaced nozzles and pop tested a few months ago. maybe the glow plug temp switch?

it has done this miss/rough start since i have had it. with all i've done so far it has helped a ton with power and smoothness, when it's warm. but it's almost like one of the cylinders isn't firing when it first starts.

Question, what is the single pin sensor to the left of the engine fan in what looks like the block on the front?

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'92 300D 2.5
'99 E300TD