1979 Oldsmobile Cutlass Brougham engine keeps cutting out

1979 Oldsmobile Cutlass Brougham 260 mileage: 135,000. Recently I had to replace the fuel pump, fuel filter, plugs, rotor and cap. The car was running well until today. It's having a problem now; it keeps cutting out unless I keep pressure on the accelerator. This seems to happen more when the car is warm rather than cold. It sputters then dies. Sometimes it will sputter when I take a corner or stop at a stop sign, when I remove my foot from the accelerator and then reapply it. On cornering it is like a quick loss of power then acceleration. Does this sound like a possible carburetor problem or possibly bad fuel? We just filled the tank yesterday.