96 S-10 4.3L vin X 5 speed. New injector, new tune-up parts (cap, rotor, wires , plugs), newer fuel pump, new distributor with module. Compression is fine, fuel pressure runs around 50 (calls for 60-66) I ran a stand alone fuel supply bypassing the pump and ran it at 65 psi with no change. Scanner shows multiple cylinder misfires with 20000 plus on cylinders 1 through 3, nothing on 4 through 6. Cat is hollow so O/2 in the rear shows no activity. Truck has lack of power and misfires (popping noise) off idle and under load. Not consistent enough to be an engine noise. Thought maybe t-chain jumped but with little to no misfires on 3 cylinders...same thought with ign coil. Internal issue should show with compression unless maybe a worn cam? Maybe faulty cap? I dont know which way to look anymore...