Is it possible to have a bad stock tune?

Fastloader

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Toronto Ontario Canada
I am having some trouble with my 2010 shelby gt500. The shop is pulling their hair out. It pops into failsafe mode at wot. He is telling me to go back to dealership and have them reflash the ECM and then retune it. I don't see how this is possible? I guess anything is possible but doesn't the tune that the shop creates over write the stock tune or does the stock tune still look after misc duties while the performance tune does its thing.

What do you guys think and have you heard of this before? Fbre7 is the strategy tune.

If that helps.

Thanks in advance. :bash:
 

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