My 08 did the same thing with the canned tunes. I still have an issue with surging on tip in more noticable in 3rd. It does it even with the stock tune. I will try to get a hold of Bill next week to give a more detailed description of the issue. Must be something with 08 with the latest calibration. Almost feels like it runs lean on tip in.
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Gryphon with 87 Economy tune, 87 Tow tune, 91 Performance tune
Roush off road exaust
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