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Intuitively that sounds 100% like what happened with the grand am but just so I'm sure I understand you...
1) You put the console shifter in 3
What fuel cut-off are you referring to? High RPM limiter?
2) You let the car upshift 1-2 and 2-3
3) When you go WOT at any RPM thereafter it is impossible for it to downshift?
In my GAGT, it had a tune on it but nothing specifically for dyno day. The shift table was essentially normal and the shift table for 3 would have been untouched. In this impala, I'm sure that table is stock.
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