First of all I'm new to the site. Some very good info going around. I have a '97 K2500 7.4l Vortec. I'm having problems starting when up to temp. When cold turns over and fires no problem. Here's what i've done so far. Replaced fuel pump, rotor, cap,wires,plugs, fuel pressure regulator. I'll also mention that when it does start(warm) it cranks over for about 30 secs+(like a Dodge) then smokes a little blue. I've notice m coolant resevoir needs topping every once in a while which tells me i may have a leaking intake gasket. No coolant in the oil so not head gasket. Anyone?