car wont start when cold

What is your question?

in the morning at 9 am this problum just started when weather started getting cold the car will rev and keep reving but wont turn over then when sun comes up and the engin get warm it will start right up and will run fine ive changed batterey changed spark pluges spark pluge wires changed out distributar cap and rotar could it be the headgasket? i hope not please help