Can't help you too much with the tuning info, that's my weaker area of knowledge. It's all in the tune though, which is why nobody but experienced LS guys should touch such a car. I would take it to as good of a shop as you can with an in house dyno. RPM is a good shop, if you can get it to them to let them figure it out, then I'd go for it. If not, then get a guy with HP Tuners and a few hours and get her straightened out.
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