1993 Oldsmobile Ciera Fuel system

My car has not been doing good we had noises for a while we replaced the fuel filter, and the the fuel pump and the spark plugs the fuel injecters and its having a hard to starting we get it started but we have to pump the gas and turn it on at least 4 to 5 times in the morning and its very hard to press on the gas pedal sometimes it wont go and at times it goes I dont know what it can be please help me