A tune-up is an essential service to maintain your engine's performance and extend its life. Minor tune-ups may include spark plug replacements, filter replacements, and fuel system cleaning. Major tune-ups may include more in-depth inspections, such as ignition timing and valve adjustments. Regular tune-ups can improve fuel efficiency, reduce emissions, and prevent breakdowns. A professional mechanic can perform a tune-up and identify any issues that may affect your engine's performance.