sputtering at 3k rpm and on

[rommel rojasgsx]

after changing to 850 injectors and 255 walbro fuel pump car develop a sputtering at 3k rpm. it ran fine before the change, plugs and wires are fine. oh i havent installed no fuel preassure regulator yet, would that be my problem? any ideas guys. thanks.

 

[cheap90gsx]

You need to update your info in your profile. Also, are you using any fuel management? If not, thats your problem.