That's not a good start. It should start more like https://youtu.be/pdL3LP9mDik
That's my 85 300 D 20 F cold start this morning with 20 seconds of pre glow and a little bit of after glow.

I would suggest checking for air in fuel and do a compression test. If both check out okay , replace the injector nozzles

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked