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If the defroster was on then the air cond compressor was running.and you may want to add that to your list of things to check .the a/c is used in winter on defrost to help remove moisture from the air and the windshield
I am guessing here w/o much info, 1 of maybe 4 things, idle speed contoller motor, low fuel pressure, dirty air filter, or lastly, carbon buildup on the throttle body throat. When cold idle the carbon blocks off the little needed air and the engines will run rough or just die.