1. I noticed a water leak on the back passenger side of the head'

2. i pulled the spark plug on the front driverside and there was a white milky like fluid on the spark plug itself. i shined a light in the hole and could not see nothing.

3. I hear a lot of tapping noise from the rocker arms. is this something that i can fix myself ?

I have been driving this truck for ten years now with no major problems until now, just general maintence. i use this truck for hunting, pulling my boat and taking my wife and son to garage sales. belive it or not, this truck can out pull my father-in-laws 02 duramax pulling a 5th wheel/boat combo in the hills of  western South Dakota. My max speed is 60 mph on the interstate with very high RPM'S. My grandfather bought this truck new and I'm now the second owner.

Thanks for the help