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Octane Booster- now it backfires

Call me stupid, but my car ran great and for no particularly good reason I added a can of octane booster during the fill-up a few days ago. Now the car runs poorly and backfires a lot unless I keep my foot real steady, not too much gas, not too little. The motor is fed by Webers. I am assuming that the extra octane requires different timing. What can I do to get past this tank of gas?

Tom

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