I am having problems with my 98 chevy s-10 not starting in the cold?

I have a 1998 chevy S-10 2.2 4 cyl and i have been having problems with it starting in the cold. It starts find during the day when the sun is up but once it goes down it just cranks but never starts..I did just replace the fuel pump, iac valve and tps sensor and still no luck..any help or if u need more info just ask. thanks