Loss of power when accelerating up a hill

The car started a habit of cutting power while accelerating up hill and when I stopped and restarted the car, it runs again for a distance and then repeats it. You feel it losing power and then finally stops. When you rest it for less than a minute and start it again, it runs again and then after a short distance, it repeats the same thing. I have replaced the fuel pump, air flow mass sensor and air filter but the car still has the same problem. What could be the problem with my car? Some advice, will be grateful.