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I can't imagine they don't validate the ECM against a checksum to ensure proper programming from the factory. My GUESS is that the problem is elsewhere.
Pressing the OnStar button seems like a good place to start, just to double-check the demo mode.
Without some diagnostic tool, like HP Tuners, it's going to be tough to diagnose this yourself. If you have a OBDII reader, I'd be checking the fuel injectors to see if they're being commanded to pulse. Depending on what's wrong, it may be hard to distinguish a fuel system problem from a rev-limiter since the rev-limiter works by turning off the injectors.
Good luck man! I'd be nervous about taking my car to a dealership too, but that might be your best option.
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