So this is far from my first engine build, long story short buddies 2014 silverado dropped #7 lifter. Did full texas speed stage 1 kit, lifters,dod delete, vvt phaser lock out. Checked double checked and checked timing again, truck barely wants to idle, intake kpa is showing 75-85kpa idling and when in gear goes up to 100kpa, checked pushrod length, had intake off several times rechecking things. all new gaskets. performed the throttle relearn but the truck after about 20 seconds off a cold start goes into reduced power with a p228D rail pressure to high, (i see it at 2500psi) at times. checked wires to pcm, fine, replaced high pressure pump per GM flow chart, still throws code and stays well above 2000psi after running. this is my first aftermarket cam in a GEN 5 and i know the TSP gen 1 should damn near idle like stock. ANYONE got any idea what the hell we are missing or may have ran into it. 35 years of experience between the two of us, just at a complete loss for what is happening right now...shit cam???
SIDE NOTE. once off cold start you have to fuel cut to get it to start