You will not harm the motor by re-flashing the ECU back to stock at the dealer. BUT.....you would need to stay out of boost and drive/shift like granny, which can be hard to do, but not impossible. So doing this would be fine as long as the custom tune will be done within a week or so. Is it recommended? No. But it can be done without harming the motor as long as you're easy on the throttle and shift at lower RPMs. In other words, staying out of boost. Going back to the (updated) factory tune will also show whether or not the stall issue is/was indeed in the present tune.
I would bet that the issue is in the tune. You want to get your car re-tuned just as quickly as possible. Do whatever you can to expedite this. JMO.
Thanks for clearing it up for me Bob. I for go to mention not to go into boost if he reflash the ecu. Yes as long as he stays out of boost, and shift like a granny there should be no problems. But what is the point of that fixing one issue and creating another one... What he really need to do is get it dyno tuned by a good reputable tuner, that should get rid of stall issue and plus give him piece of mind. Because right now he doesn't even know who tuned it.
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