Engine cranks will not start

I replaced the crankshaft position sensor, oil pressure sensor and also the fuel pump. After replacing the pump, it ran fine got in it today it turned over started and shut off shortly after. I have no codes popping up and now it won’t start. I gave up searching for the problem went out about an hour later turned over and started right up and died before i could do anything else. I’m at a loss here. Not sure what to do next.