Bought an '89 190E, 2.6 in the fall. Have had trouble starting it in the cold weather. Have to crank it for several minutes on the especialy cold days, and once it starts it's ok. Had put in new plugs in the fall. Any ideas?

If you have put platinum plugs in there then start by replacing those with bosch orignal copper plugs.
If this is not the case then I would guess the cold start valve is giving you problems.