Truck stopped running and wouldnt start again so replaced the fuel pump still no

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Truck stopped running so replaced the relay fuel pump fuel filter and got it to start for a few minutes before it died. it wouldnt hold an idle and wouldnt start for a whole day now it will only stay running when floored. Then it floods with gas and spits out lots of fuel out of the exhaust pipe. Not sure what to do. Had a friend look at the fuel injectors and break one of the rings. not too sure if they got replaced or not. We also replaced the spark plugs rotor and cap.