What's causing the car to hesitate & cuts off while driving? on 1997 Chevrolet Monte Carlo

I had a new fuel pump placed on my 97 monte carlo LS & it drove just fine leaving the shot, but the very next day the car started acting like it didn't want to go & when I give it some gas it shuts off,please tell me what the problem

did you change the fuel filter when you changed the pump ? check your fuel pressure