I've got an early 1981 300SD (617.952-12-000555) with 250,000 miles which has a very slow idle when it is first cranked in the morning. It has gotten worse as the morning temp has dropped. Temps are getting into the low 40's these mornings. If I don't give it a little fuel when pulling out of the garage, the engine often dies. As soon as I reach the end of the street, the idle is normal. I do not have this problem when I crank later in the day. Every once in a while, I experience some hunting if I put the car in neutral. Acceleration is good at all operating temperatures.

Any ideas?