Morgan,
If it's not shifting, I would certainly not be giving it full throttle! This is a smart car. You won't get any turbo boost if the tranny ECU is not sending proper information to other parts of the car. It's sort-of like insurance so that you won't do permanent damage to other components.
DID YOU CHECK FOR CODES? When I had shifting problems, it was because of the PNP neutral switch that went bad. If your's is bad, you'll have a code for it. Do you have any warning lights? Do you have a blinking "arrow-up" on the dash?
Do you routinely (each year) have the transmission flushed?
I would guess it's the PNP or a bad tranny ECU.
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