Similar problem with my 83' 300D. It gets down to about 38 some nights, which isn't too cold. Here's the weird thing, the car starts right up without any issues. After I glow it, she fires right up.. and proceeds to run like garbage. The engine shakes, idle is incredibly poor, and giving it some gas has very little effect. Exhaust blows lots of white smoke (with what looks like a blueish tinge, but I could be wrong.. since the engine doesn't burn oil that I know of.).

Once the car warms up, she idles like a champ, and continues to do so until the engine gets "cold" again. I stopped it from stalling out by replacing the idle speed governor bolt with the "updated" gold one, but that didnt' seem to fix the rough idle. Glow plug issue?

Thanks!

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(Oo{=|=}oO) 1983 MB 300D USA, 212,000mi. 80's yellow/white. "Gunther"
(Oo{=|=}oO) 1984 MB 300D Euro, Turbo Added in Germany, 186,000mi [SOLD] Missing her dearly.
(Oo{=|=}oO) 1984 MB 300D USA Turbodiesel, 269,000mi. [SOLD]