fuel problem

[87gnstock]

I have the stock injectors on my 87 gn with 30k on them. I upgraded fuel pump adj fuel pressure regulator power plate and my fuel pressure is 39 with the line on. And i am still getting knock i shouldn't be getting. The only other thing i can think of are the injectors? Which are the best for driveability? I heard blue tops are good but again i don't know that much.

 

[crazygn]

do you have a scan tool , what are your o2's , and 39psi with the line on sounds high to me like you might be running rich. What is it running with the vacline off.

 

[87gnstock]

mostly around 710- 840 at WOT And i am only running 8lbs of boost with 3-5 degrees or retard. I run anymore boost and it gets worse. Any thoughts?