Hey I am currently running 8psi on my b16a3 and i have msd injectors installed as well as a spa FMU. Is it required that I have a higher volume fuel pump? Also im fighting with a rough/surging idle. My Car is not hitting any lean spots on the air/fuel guage. would adjusting my fmu aid my idle problem? I am also currently running an msd digital 6 ignition system with the timing set stock. I have not experienced any detonating but i sometimes notice a pop or backfire between shifts. The injectors are currently tuned down in the lower rpm via apexi vafc (i know its temporary dont worry)

Any info or direction would be greatly appreciated