I’m halfway through my second tank of premium and it’s not getting any better. And I let it get pretty empty before refills just for that purpose. I took the metal heat shielding off the spark plug boots, still the same. Wires are brand new OEM replacements, plugs are brand new AC Delcos. I’ll pull a few later to see if they’re properly gapped. I got an ICM and coils coming on Tuesday. We’ll see if that does it.