Just Installed Tune: 91 Octane Livernois on 2013 SHO

have you done anything with your spark plugs ? have you tried to put your stock tune back in to see if the problem goes away ?
 
For those of you with this issue, it had came to our attention that some of our customers have some issues with a stumble that only became present to those using winter blend fuel in colder climates. After thorough testing, both with our own vehicles, and select testers we have devised a solution for this unique issue. This update completely addresses this issue for those exhibiting it. Please send an email in to info@livernoismotorsports.com if you have been experiencing this condition. For those of you lucky enough to be in warmer climates, this update is not necessary. We appreciate everyone's patience with this.
 
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