1994 Chevy Cavalier My Car Is Hard To Start...Help Me Pleas

My car will start but I have to push and hold the gas pedal down constantly until it starts. And I have to do this everytime I start the car. I have changed the gas filter and cleaned the fuel injectors and have done everything I can possibly think of to do.

Could it be the gas pump? Or a sensor or the computer maybe??

Can you please tell me what I need to do to fix this problem. It will be greatly appreciated.

Thanks Alot,
Charlene C.