The 07-09 cars seem to get the stumble worse from what i have seen and its not just the cruise stumble, its during acceleration like you mentioned. This is normally 100% remidied with a custom tune.
Stock boost target is 13.5psi
I would definatly take it to a trusted mechanic in the first few days for a checkup since the dealer can miss quite a bit.
Congrats on the new car and they can be fun.
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