In desperate need of help, have an 08 silverado 1500 5.3. Driving it just shut off like the key was turned no noise just shut off, now it'll crank but won't try to start (even on spray) I've now replaced cam sensor,crank sensor,ecm new programmed key and immobilizer and the truck still just cranks and no start, no security lights or codes. Anyone have similar issue or ideas how to solve it? Also has fuel pressure at the injector rail, has spark and fuel pump does kick on. WILL NOT EVEN SPUDDER WITH STARTING FLUID.also have checked every ground wire.