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I have a 93 with a 351 when it is cold it will not run. I t diesout when you give it gas but soon as it get warm its fine. Changed air idle motor on it to day no change any other ideals.
One thought is you have a vacuum leak or an intake leak. The engine is having a really hard time running when it's sucking ice cold air in where it shouldn't on an ice cold motor.
Once it warms up it is either A) having an easier time dealing with the vacuum leak since the engine heats up the incoming air quickly, or B) the metal of the engine is expanding with the heat and is actually sealing the vacuum leak (ie. around the manifolds).