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Tuning problems

474 Views 5 Replies 3 Participants Last post by  SNK VNM
Hello everyone. I bought a 2017 Gt last year so I thought start with the basics I put a cold air intake and a custom tune at the local dyno shop. He must of ran it 25+ times on the dyno( over 3 visits) it keeps pulling 8 degrees of timing and can't figure out why. Has anyone heard of this?
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Yes it does have x pipe roush mufflers . I run 91 octane. Hard to find anything higher. And that's why I'm on here my tuner can't figure it out. And he has 15 plus years just tuning. And mostly mustangs.
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Nothing. Tried that aswell.
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