check engine light 43

ok its fuel system supply
story:
car feels like its not getting enough fuel or its leaning out i guess... point being that is not driving normal it was sluggish unitl i replace a few things on it and then check the check engine light ( i havent checked it before because it would go away after i turn off the car but realized it would still show up if i jumped it )
how do i go about fixing this?
done
fuel filter
fuel pump
MAP Sensor
IAT (car runs and idles a little better when i replaced the map an IAT)
switched ECU
Check plugs, wires, injectors, Cap, rotor, coil
i am compleltely clueless of what to do now
It'll drive ok but it wont let me hit redline
when it gets close it feels like its losing power around 55-6K
any help appreciated
story:
car feels like its not getting enough fuel or its leaning out i guess... point being that is not driving normal it was sluggish unitl i replace a few things on it and then check the check engine light ( i havent checked it before because it would go away after i turn off the car but realized it would still show up if i jumped it )
how do i go about fixing this?
done
fuel filter
fuel pump
MAP Sensor
IAT (car runs and idles a little better when i replaced the map an IAT)
switched ECU
Check plugs, wires, injectors, Cap, rotor, coil
i am compleltely clueless of what to do now
It'll drive ok but it wont let me hit redline
when it gets close it feels like its losing power around 55-6K
any help appreciated