Missfire under WOT ls3 swap PSi harness

[badazz81z28]

Glad to see you got it worked out, reading the initial post I felt it had to be the tune. Lesson learned here is who does your mail order tune. Some folks, I think Frost is one of them, they fix it it free it something doesn't work right for like a period of 30 days. Dyno tune is always best