Just curious, but is it happening at a shift point and/or high RPM?
Brad hopped me up so much over stock on a 91 tune that I ended up hitting the rev limiter with my stock shift points and had big drop in power and what sounded like free spinning engine. I thought I blew my trans, but he just needed to pull up the stock shift points a touch to prevent hitting the rev limits.
I could see if you were spinning in snow that you might rev up a lot faster than just charging along on dry pavement, so maybe it's hitting some sort of rev limit? My "Torque Source" read 4 at the time of my events, which indicates "Engine Speed Limiter".
