My truck won't start!

Hey people, new guy here needing QUICK advise! I have a 1989 S-10 and it doesn't like to start on cold mornings. No matter how many times I turn it over, it just won't start. It starts fine after it warms up...I know this because during the middle of the day it's fine, and I even once pushed my truck and turned it around, poped the hood and let the sun warm the engine for about half an hour and it started fine.

Anyone know what is causing this? I am typing this @ 5:18pm and I need my truck for work tomorrow morning! HELP!!!