My 93 300D just started to miss few times at start up then smooth out. is anything bad about to happen? got 270k on it

You probably have a bad or weakening glow plug. The cylinder misses until enough TDC cycles occur and that cylinder warms up.

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'84 190D 2.2 5MT (Red/Palomino) Current car. Love it!
'85 190D 2.2 Auto *Cali* (Blue/Blue) *sold*
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Does it miss right at startup or does it take about a minute before it misses? Bad glow plugs are usually indicated by the glow plug lamp. Check and monitor your coolant levels for the next several months.

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92 e300d2.5t
01 e320
05 cdi
85 chev c10

I would first a complete check on all the glow plugs, glow plug relay, and glow plug relay fuse if applicable. Then secondly I would check all the fuel line connections (especially for the suspect cylinder) to eliminate any minor fuel leak/air intrusion. Lastly monitor all fluids and see how it goes. I'm betting on a weak/bad glow plug.

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2012 Mercedes ML350 Bluetec 91K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 231K (mine)
1998 Volvo S70 T5 Turbo 196K (kids)
1994 Ford F150 4WD 249K (firewood hauler)
1983 Mercedes 300D 376K (diesel commuter)