When you start the car for the first time after it has been sitting for a while, it fires right up but has an intermittent miss at idle that clears up after a few seconds. It doesnt seem like it misses at any rpms above idle. I initially assumed it was a leaky injector losing prime, but that would still miss at any rpm. MAybe a bad glowplug? My glowplug light does not come on, but the car fires very easily. Ideas?

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1983 300SD.....169,000 miles but quit counting a few owners and unknown years ago!

Check your glow plugs.

You have a lot of posts for a new member. Welcome. But please remember that the search function, given a little effort and time, will answer most of your questions.

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'85 300TD "Puff The Magic Wagon" - Rolling Resto
'19 Mazda CX-9 Signature - Wife's sled
'21 Morgan 3-Wheeler P101 Edition
'95 E300d - SOLD
'84 300TD "Brown Betty" - Miss this one
'81 240D "China Baby" - Farm grocery getter

Check the Glow Plugs and you could have a small Air leak.

The Air leak would be in the Fuel Supply system.
The Injectors are in the Highe Pressure part of the system and there would be high pressure Fuel sprayed from an external leak.
In order for the Injectors to lose their prime so to speak the Nozzle seats would have to be badly worn or the Delivery Valves in the Fuel Injection Pump would have to be letting the Fuel seep past them.

If you are running the Stock Bosch Fuel Injection Nozzles there is tiny drilled passages in the Pintel of the Spray Nozzle. And, they can get plugged with Carbon and cause a rough idle.
Look in one of the rough idle threads where I have pic/s.

MW Fuel Injection Pumps do not hav the Delivery Valve Holder O-rings. But, some had similar symptoms when their Delivery Valve O-rings started to go bad. The claim is that somehow Air is pullled past them.
There are some threads where changing the O-rings solved the Problems.

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84 300D, 82 Volvo 244Gl Diesel

Only the first start of the day, no matter the ambient temperature. Had to give it a bit of throttle to smooth it out. Only for about 4 seconds. After it was warm it idled perfectly. Turned out to be #5 glow plug. Now I can startwithout touching the throttle, even on the coldest day. (hehe, where I live,that might be 32 at the most bone chilling :>) ). Glow plug was an easy quick fix.

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85 300TD FED-Daily
84 300SD-Wife's
86 XJS-Sunday
66 GMC-Work- Given to my stepson
83 BMW Airhead- Given to my stepson

Definitely, check the glow plugs. One cylinder is missing until it warms up a little.