We did the full zzp stage 1 . Northstar throttle body different mass air flow. Exhaust manifolds. Smaller pulley and PCM tune. Now car cuts out after 1/2 throttle and shifts at like 3000. Zzp won't help me. Anyone have this issue or know why and how to fix. Never had issue until throttle was installed. Idk if we got wrong throttle body or wrong mass air flow. Got throttle outta 2001 Northstar . Which worked great with adapter. And used mag from 04 Silverado 5.3.