1999 ford expedition hard to start when its below 0 on 1999 Ford Expedition

starts when its above 25 degrees

Asked by for the 1999 Ford Expedition
is it a no crank,or cranks no start/hard start?
turns over but wont fire if you touch the gas slightly it fires right up changed the idle speed control. did not help, i'm thinking of cleaning the idle air control they have been known to carbon up what do you think?
If you're talking about replacing the Idle air control valve then yes that is a very common failed part.The symptom would be a vehicle that fires up initially then stalls immediately or idles really low,even had some that would make a howling noise kinda like blowing across an empty bottle.Let us know what you find!