11 Ls3 From a Corvette (just bolt ons) and a built 4L60e with aftermarket harness running a TCM from an 08 Silverado 5.3 2wd. I'm new at tuning this thing and an issue I've been having is when I lean on the throttle (I'd say over 50%) it'll downshift, but then seems to fall on it's face kind of stumbling and accelerating very slowly. If I don't get on it, it drives ok. I'm not sure if it's a tune related issue, but any feedback is greatly appreciated.
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