these lights are coming on and flashing when i 1st start my truck and stay flashing for a few minutes down the road. is there some sensors that maybe bad?

also, my service 4wd light has come on a few times. truck sometimes does not want to go into 4hi, but will go into auto4wd if i push the button. then i try to get back into 2hi and the 4lo light will blink. i don't think it is a computer problem. i think it might be crap (mud & water)getting into the wiring harnesses that plug into the transfer case.

haven't been around in a while guys. been at the summer home with no internet access. not a bad thing though. going to PGA wed and thurs this week. anyways, why is my truck possessed? (sp)