fuel and spark but won't start

[tim40229]

It's a 2000 Yukon Denali OBS 5.7 liter. I have 64 psi when cranking the engine and bright blue spark. But it doesn't even make an attempt to fire. Fuel is getting to the cylinders. I disconnected the battery I reset the security system I changed the coil I checked for top dead center I checked the grounds I sprayed starting fluid in it I cleaned the plugs (they aren't very old) nothing is working any ideas???