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Check/replace the spark plugs and wires. If you're not going to replace the plugs make sure the gap is correct (should be either .040 or .060) and make sure the plugs are clean of oil or gas. If it still backfires after you replace the plugs/wires check the distributor and the timing.

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17y ago
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6mo ago

Backfiring during acceleration in a Chevrolet 305 engine can be caused by issues such as a fuel system problem, ignition timing that is too advanced, or a vacuum leak. It is important to check the spark plugs, fuel filter, ignition system, and vacuum hoses to diagnose the exact cause.

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Q: Why is Chev 305 backfiring on acceleration?
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