So I have a 2002 5.9 24 valve. I was driving on the highway and the truck died, but I still have fuel pressure because I can constantly check it on my edge tuner. I do have a fass fuel pump, we primed that and checked it. My alternator was bad, so we fixed that. We checked all the grounds, and pretty much checked everything. But obviously we missed something. Does anybody know what could possibly be going wrong? It starts up and runs for anywhere from 30 seconds to 5 minutes, and then the throttle jumps up and down and then eventually stalls. All while maintaining 18 psi fuel pressure. Help is greatly appreciated!