It's a bummer these cars don't come with a wideband stock. I get a stumble just off idle if I leave it in gear, but I think that's normal. My car was smooth and torquey down low before my intake.
I bought the GMPP intake and tune - it drove (and still does, IMO) very different and weird from my 15k mile stock tune - kinda lean in some areas, kinda very rich in others, did all sorts of weird things to my throttle response. It's definitely getting better after a little bit of time to adjust LTFT, but I think the combination of the new VE table and other adjustments for humidity/temperature/etc. (which were designed for the old VE table) are causing weird hot-spots in the fueling at low temps.
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