I had pretty much the same symptom until I replaced all the glow plugs - turns out 2 were bad and the prechambers were carboned up (reamed them out). I could get it to start just fine, but it was missing - each miss would have a puff of white smoke associated with it. This would go away after about a minute or so, sometimes less depending on outside temps.

I know I could have probably found the bad GPs per DG's (and/or this forum's) instructions, but the car was relatively new to me at the time and I wanted to have 5 new plugs all at once.

Hope this helps (might not if the rough idle continues for more than what I have pictured in my head)...

Exactly how long is the rough ide?

On a completely other note... I wonder how many forum members are Vermonters?

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Blue '83 300D "Domobile"
Red '73 Cimatti City Bike (moped = fun)