My recently acquired 1985 300TD is a joy to drive but I have noticed one oddity. When the engine is cold, at idle, it will hiccup a few times. This only happens for a minute or two until it warms up. Anyone know what it is? The engine does not have the manual idle control like my 1977 300d so I assume there is a mechanical/electrical/vacuum substitute that may be causing this. It is not a real problem but I wonder if it might be at 10 below. I believe it goes away if I give it a little more fuel.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13