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Detonation of the fuel caused by timing to high and/or low octane fuel. Have someone check the timing and use a higher octane fuel maybe a booster.

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Q: I have an 86 Jaguar refit with a sbc 350 and edelbrock Q-jet clone. It occasionally sputters and continues running after turning off the ignition. This will stop if I hit the brake. What causes this?
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