I have a 1992 Chevy 1/2 ton 5.7 Litre 1500 series truck. The truck while idling suddenly stalled. I verified the fuel pump by taking the pump side off to the filter and verified fuel to the filter by turning the ignition and hearing the pump energizing. I did replace the filter and then verified fuel to the injectors. After sitting for an hour the truck will start again and then run for a minute to several minutes. I have even revved the engine and watched the fuel flow from both injectors into the throttle body. This tells me I am getting fuel to the throttle body. Fuel is running into the throttle body and then suddenly the engine stalls immediately. The engine doesn't sputter and choke then shut down, it shuts down quick. One time while the engine was running I put the filter and lid back on and it quit immediately. Almost seems like the old carb days where the o2 mixture is crazy but of course this isn't a carb. When the truck is idling it idles smooth and perfect before dying. Any help on this matter would be great. Thank you in advance.