okay, here how goes i had 550cc injectors. Had issues with leaning out at 4100-6000rpm. so replaced them with 780cc and thought that would cure my fuel problem,but it didn't.the car runs great 1st-3rd and when you hit 4th and at 4100rpm it run lean. my setup is 780cc injectors,aem afpr with 6-8inch fuel line kit, 255lb walboro fuel pump. running vpc and safc for fuel managment. turbo is gt45, 4inch all the way bck. motor fully built. i need some help.