Hard starting from cold after diesel purge

[TomAllen]

I did a diesel purge on my 84 300SD last summer and changed the filters. No other changes. I had previously set the idle down to reduce rocking that I couldn't trim out with the rack damper. After the purge it idled dead smooth. However, since then when you start if from cold I have to give it a little throttle which I didn't have to do before. If I forget, it just cranks without starting. When warm, it starts right up with 5 seconds or so of glowing.

Now that it's colder, you have to move the pedal up and down a bit till it catches. Then it starts right up and is smooth. This is not too much of a bother except that I fear that as the weather gets colder the problem will get worse.