I have a 1999 chevy silverado one day was driving down the highway truck was running just fine then just shut off. I changed crank shaft position sensor camshaft position sensor fuel pump fuel filter fuel pressure regulator check timing chain and is in time not wore out either changes ecm and had it flashed also did the relearn the truck will start on starting fluid but runs like crap and the minute you quit spraying it shuts off I have tons of fuel coming up to the engine but none of it getting to the Schrader valve can't figure this out also no security light is going off