870 air fuel issue

[Bradar]

07 isx 870 having issues with over fueling. Loaded I very seldom have an issue usually empty or bobtail. The problem is when you are going down a hill or 1/4 throttle and you go to accelerate and no power just a lot of black smoke out of the stack. It will clear out but it takes a few seconds. It started this 2 weeks ago so I done an injector leak down test and found number 5 injector was leaking so I replaced the 4,5 and 6 injectors. The truck idles better but that’s about the only change I have noticed. It still has the over fueling problem. So I done a cac leak test and found a small leak on intake clamp and oring fixed that still the same issue. The boost controller has sufficient air pressure and the truck has 32psi of boost. Has anyone ever had this issue? Thanks!