Yes mine is also a flex fuel. My truck was built late 08 so I guess it already had the latest flash. Its not a real bad surge but its there. I can really hear it in the tone of the exaust when it does it, sounds like i'm getting on and off the throttle.
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Gryphon with 87 Economy tune, 87 Tow tune, 91 Performance tune
Roush off road exaust
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