Missfire at high rpm or at shift...

[98DaytonaGTP]

I have a missfire at high rpm or at shift when I'm hard on the gas... At least it feels like it's cutting out at or around shift. Anybody know why?

Stock tune, auto light 104s, speed daddy headers, 180 thermostat, stock supercharger pulley, ls7 lifters, cold air intake.

[Fivefingerdeathpunch]

I can only assume 91+ octane fuel aswell or atleast hope you are using it.

Plugs are too cold for those mods, some AL 605's would be a better choice.

And what gap are the plugs at?? I'd lower them to .050 if they are larger.

Clean all coil pack terminals and use some electronic grease on them aswell, do all the little things to see if any of them do a fix.

[98DaytonaGTP]

Ok IL try to lower the gap to .050 on the spark plugs and go from there.