When setting the timing on an engine, what could be set wrong that will not prevent the engine from running, but will cause vibrations?

Name: When setting the timing on an engine, what could be set wrong that will not prevent the engine from running, but will cause vibrations?
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The Answer of When setting the timing on an engine, what could be set wrong that will not prevent the engine from running, but will cause vibrations?

When Setting the Timing on an Engine, What Could Be