Rb20 running bad when warmed up

[ctvs12]

Hey guys

I have a rb20 and for some reason the car is leaning out to like 18's on my wideband and sputtering when under boost, it just started doing this and I'm not really sure what could be wrong I thought maybe my walbro 255 was going bad but my fuel pressure gauge seems to be acting like it did when the car was running fine. Anyone have any ideas what could be going wrong?

Thanks in advance

[Gabes13]

Whats your fuel pressure? Stock tune? Rom tune? standalone? More info please.

[ctvs12]

Thanks for the reply and sorry. I have a rb20 with a standalone aem series 2 that's been tuned, 550cc injectors, walbro 255, gt3076r, and frontmount. I'm getting right around low 50's on my feul pressure gauge. If there is anything else you need to know please let me know and again thanks for your help.