at first start up,it always starts but it cranks alot before it starts, to me for a efi engine, if i shut it off, or drive it a little it will start right up. utill it sets, then its cranks alot..but it always starts....its like it looses its prime or something.

 

Might have a leaky injector.


Sniff the exhaust next time it starts up and see if it smell rich. I'm having the same issue with my Durango right now, just too cold to deal with it.

 

It could also be a bad check valve or something else is allowing fuel to drain back into the tank. Prior to starting for the first time of the day, cycle the key "on" than off a few times (maybe, 3-5?) and see if this helps. Doing this will prime the fuel system.
Don't wait too long.
For instance: get in the truck, turn the key on. Wait a second or two and than immediatly turn the key off. Wait like half or a whole second and turn the key back on. Do this several times, see if it helps.

 

it seems to start ok doing that, where is the ck valve?

 

I believe its integrated into the fuel pump. But wait for someone to give you a better answer.