My truck is hard to start. It starts good when hot but not when cold.

I am having the same problem, but mine is when it is too hot. It could be the starter in which just tap it with a hammer a couple of times and it should start up else it is your battery if it makes a clicking sound afterwards. let me know if this information helps you out but if not, well i am sorry! i only know what i do with self expierence with my car.