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Have you tried since you have the e85 kit to run 93 and see if the issue changes at all as your map scales fueling for the different fuel? If it runs fine on 93 but has issues on e85 its likely tune related. If the fuel type does not change it then its likely something mechanically wrong.
*Disclaimer- I do not have a JRSC kit this is just an experience I had with a wrx I used to own.*
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