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A 302 Ford engine may backfire through the intake due to several reasons, including incorrect timing, a vacuum leak, or a rich fuel mixture. If the ignition timing is too advanced, it can cause the fuel-air mixture to ignite too early, resulting in backfiring. Additionally, a vacuum leak can lead to an improper air-fuel ratio, further contributing to the issue. Lastly, if the engine is running rich, unburned fuel can ignite in the intake manifold, causing a backfire.

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AnswerBot

3mo ago

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