I have a 379 with the c-15 mbn a couple weeks ago it started missing bad while accelerating, replaced wiring harness under valve covers and went through the harness from ecm to the rocker box. Replaced the ecm and #6 injector. Runs a lot better now but something still isn’t right. Loaded and full throttle I can only get about 22 pounds of boost through any of gears, truck had more power before this started. I hook up the truck to computer and shows no codes but if I do the diagnostic using the cruise control it shows boost pressure sensor fault atmospheric pressure sensor fault and at one point it showed injector 3 or 4 fault. Any ideas on the next step I should try? I don’t have the money to just start buying parts and it not fix it. Thanks so much for any help.