Why would my 98 mustang run for 45 seconds and quit running?

It's got a new PCM that has been flashed or whatever from a ford dealership, keys have been programmed, new plugs and wires, new coil packs, new battery, new battery connectors, used CCRM, new intake manifold, new fuel pump with fuel pump assembly, and a new fuel filter

I think that is a question for the Ford guy who did the PCM…