Hey i have a 97 vortec 454, falls all over itself accelerating from stop, if u really get into the throttle when trying it it shakes and sputters but goes, chased mass airflow wasnt the cause. Bank 1 at 25% long fuel trim flushed injectors and have good gas. But i found that when looking at cylinder #1 advance its 25*. But when getting on the throttle it retards to as low as 2*. Unplugged knock sensors to eliminate the possibility of the vcm seeing detonation. The cmp retard offset is 1*. Running out of ideas appreciate any help. Comp cam that is supposed to run with stock factory injection. Honed cylinders and knurled pistons. Decked heads.003. Valve job.