What would cause the truck to start sometimes and not start other times!

No, but it seems like it s cold or wte when truck doesn't want to start!! Do u know of anything that would cause this!!

Until diagnostics are done to prove what is working and what is not, and then narrowed down to the actual cause it won't do you any good for me to list everything that I know "could" cause the problem. You need to start by finding out if you have spark, fuel, (which includes injector pulse as well as fuel pressure) or of you are missing both spark and fuel when the truck isn't starting.

I was told that a connector below the cab under the drivers seat s famous for having miosture problems and needing to be dried out and repaired, this could cause the problems I am experiencing! Do u think that could be my problem, cause when the truck s running it idles rough and check engine light comes on!!!

If it is, you should be able to prove it first. What code is setting?

Would crankshaft sensor cause my problem? Only code is P0320!!!