A well tuned engine delivers the best balance of power, fuel economy and produces the lowest level of emissions. Modern engines compensate for worn parts to a degree, giving you the sense that every thing is fine with your car.
- Have the spark plugs replaced with the correct spark plug type at the manufacturer recommended intervals.
- Have any other ignition systems and / or emissions system parts replaced that may be needed or recommended.
- Replace the fuel and air filters.
- Have the ignition timing and idle speeds adjusted, if applicable.