cold Starts

I have a 2001 chevrolet Tahoe that I just purchased this year.

It is starting to get cold but not really cold and it is already not wanting to stay running in the morning till it is warmed up.

My wife is having to stay in the vehicle reving it for quite a while till it gets a little warmed up before it will run by itself.

If it were carbureted I would say choke but I don't know what it would be on this.

Any ideas???

Thanks for your help in advance

could be the IACV ---- (idle air control valve) this valve sorta take the place of the choke on a carburator