Ferm, help..........

[charlie_the_tuna]

so my truck, 2002 Yukon xl with the 6.0, when I go to start it up it takes on the second or third shot. it turns over fine but wont catch till 2 or 3 turns of the key. if this was back in the day i'd swap out the plugs and maybe cap and rotor. on these things, I don't know what the crap is going on. what does a tune up consist of on this motor??