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Cross-firing due to bad sparkplug wires (if so equipped), a bad distributor cap (if so equipped), too lean a mixture causing pre-ignition, vacuum leaks, too much spark-advance causing pre-ignition, overheating, insufficient octane in the fuel (if high-compression 350).

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βˆ™ 2015-07-17 17:56:11
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Q: What causes a 350 Chevy engine to backfire under load?
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