2000 gmc safari AWD 4.3

[fcpcs13]

was driving up slight incline in road vehicle sputtered backfired and died no codes. I changed the ignition coil it was bad check ICM was good. changed cam shaft sensor and crank sensor also had vcm flashed up to date. Changed timing as well due to high milage and chain/gear wear. still no start. have fuel pressure with Schrader valve out shoots al over the place. cant figure out why I get no combustion #1 is TDC timing is set. could this be a bad wire somewhere that im overlooking? I have worked on vehicles for 18 years but im stumped...

 

[kickass audio]

Have you checked the voltage and signal for the injectors? Also have you confirmed spark on all plugs? What happens if you give a shot of carb cleaner or starting fluid in each piston and crank it? Does it sputter like it is firing or just keep cranking with no spark?

 

[BlazingTrails]

did you measure the fuel pressure? you say it shoots out of the shrader valve but those engine are very picky about the fuel pressure. must be over 60 psi to run, if you have 20 psi fuel will spray out of the valve......