Droske

Okay I’ll try and compare but I don’t think it’s the same. You don’t think the ecu would shut down injector if it’s detecting a misfire to avoid flooding that cylinder. I was thinking of a leak down test. Or see if it’s a collapsed lifter

Coolant seems normal.

I have a 2015 GMC Sierra Denali 6.2 L. I have been experiencing a misfire on cylinder eight as well. Cylinder has good compression 175 has spark, ommed wires, new fuel injector new ECU however the injector loses pulse after start it pulses twice Then loses all power. Checked with node light. real head scratcher. What am I missing?