Ok so this has just started happening in the last couple of weeks. I will be driving and usually when the truck gets up to temp the tach will start to jump all over the place and the truck dies. I can start the the truck right after it dies and the tach will jump around some more then die once again. If I let it sit for maybe 2 to 5 minutes will start fine and usually will run for the rest of the day, but it has been progressively getting worse. I changed out the fuel filter today just thinking maybe it was fuel delivery, but still same issue. It is the 5.7 TBI I checked the injectors one looks kind of melted, but still delivering fuel in a perfect cone. I also checked the pump once it died and it is still priming fine. Any suggestions would be greatly appreciated.