Your idle speed is a bit low. Sounds like about 800rpm, It should be at 1050rpm. Adjust that (just below the choke from memory) and see if it helps.
+1 on checking your air filter is not clogged up.
Another thought ... I wonder if the dealer put the completely wrong map in. Does it do that every time in the same circumstances? It is very strange and haven't seen that before. I would get the dealer to fix it under warranty.
Doe the show an check engine light warning?
Cheers, Richard
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09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge
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