1998 Acura Integra 1998 Acura Integra gas pedal problem

Engine Performance problem
1998 Acura Integra 4 cyl Front Wheel Drive Manual

when I weigh on the gas pedal for the first time the pedal is hard, feeling locking when I push on it, gas come late.I think this is fuel pump, because I put a new engine and before I change the engine, I have same problem, but just the first time I push the pedal gas now I have the problem all time. Help me please.