somethings wrong with the fuel system!

[awd laser]

a constant buzzing code which is what i got, means the ECU is trying to say there's something wrong with it itself. So since my uncle had 2 eprom ecu's layin in his garage i threw them on an the car was still acting the same so idk what to do now. The problem is that when i would step on the gas pedal lightly at rpms lower than 2k, the car would stutter and the rpms would drop then soon jus die!