idle problem while warming up

My 95 is having a few idle quirks. When cold it will start right up and idle fine for a minute or two, then it bucks and chokes , the rpms go from about 3K to 0 and back again like crazy. If I make it past this point and the car gets completely warm,, runs and idles perfect. This just started when the weather dropped in the teens, today it is about 40 and is still doing it. Help!!!

Anyone have any ideas ?

Clean the throttle body and the Idle Control Motor. These can get pretty dirty and cause bad/rough idle.

Cleaning the EGR would probably help.