newbie tuner, manual car with mods bucking, misfiring 1k to 3k rpm, runs ok 3k to 6k

[stevebbc]

I copied a tune from HPT repository of a Z06 car with almost identical mods but results were the same. I've been logging STFTs and copying them over to the VE tables and smoothing with some slight improvement. Do I need to look at spark also and how would I tell how much to add. Not making much progress. Tune and log is attached if anyone has time to look over.

806 heads were ported locally by a guy that is supposed to really good. Other mods include Z06 cam, LTs, no cats, rear O2 delete, LS6 intake. and rebored block.

[steelmesh]

Maybe you are super lean or super rich, do you have a wideband? Is this under WOT? If not, check under light load, STFT should be cycling positive/negative or the O2 sensor should be bouncing rich/lean.

[stevebbc]

Using narrow band sensors and condition is at medium to wide open throttle. Will try looking at STFT's and O2 cycling under light load. I get what you're saying. Thanks