Spark plugs act as little detonators for a series of explosions, so if they're not appropriately gapped, they can fire at the wrong temperature. This incorrect temperature can cause several engine issues, including misfire and inefficiency. Almost all spark plugs require a gap that falls into the 0.028-.06 inch range. You should always check the gap on a clean plug, so using a wire brush to clean the electrode might be needed before measurement.
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