Heeeelp please. So car has cams, 3071 turbo, full exhaust, 3.5 ic and piping, fuel rail, ets intake, injectors, pump, tuned to 430whp. Above 3000-3300rpm runs flawlessly. Below that giving it gas (any throttle position) it bogs, stutters, backfires, and the AFR maxes out as well as logging some knock (1-3). No boost leak, MAP is fine, MAF seems ok (as per the AP), idles fine at 13.x afr. Worst is getting off the line at lights, just does not want to go. Working with my tuner but would like input from you guys in case there’s something obvious.