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Dealer is waiting for the part to complete the TSB, but no codes were set by the surging so they're clueless.
This is what I was afraid of... without codes or being able to duplicate the problem the dealer is essentially refusing to do anything.
I'm looking into getting the car on a dyno in Phoenix with a good GM performance shop to see if we can duplicate the problem. Other than that, I'm not sure what to do.
Anyone have a contact at GM customer service that isn't clueless about these cars?
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