Combustion-powered, fastener-driving tool generating sparks in succession when triggered

A combustion-powered, fastener-driving tool comprising:

• a housing;
• a cylinder disposed in the housing and extending vertically;
• a piston vertically movably supported in the cylinder;
• a driving blade coupled to the piston for driving a fastener;
• a combustion chamber frame vertically slidably movable along the cylinder, a combustion chamber being formed on top of the cylinder by the combustion chamber frame and the piston, the combustion chamber accommodating a gaseous mixture of existing air in the combustion chamber and fuel injected therein;
• a spark plug that is disposed in the combustion chamber and generates a spark to combust the gaseous mixture in the combustion chamber;
• a trigger that produces the spark in the spark plug when operated;
• and
• a spark controller that generates a plurality of sparks in succession with the spark plug.