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Just a thought, have you tried using a different gas station?
Where I live, they mixed up 87 Octane in 94 Octane and it caused a whole lot of headaches with people having to be careful.
Since I'm tuned with turbo, any drop in octane is danger to the car and I've had a bad tank that caused it to sputter around 2500rpm.
If you can find some E85 locally, try putting 5-7L and fill up the rest with the gas you usually use and see if your car starts running more smoothly.
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AVO Turbo with FlexFuel| Perrin 2.75" CAI(gone) | Now: Perrin 3" Catback | MXP Comp RS Catback(gone) | Magnaflow Catback(gone) | Gruppe-S UEL Headers (gone) | 18x7.5 TE37 on Firehawk Indy500 225/40/18 | Valenti Tail Lights | Drift-Office Tuned 220whp-350whp
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