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Every vehicle needs fuel, air and electricity to run.  A Tune Up is a generic term for servicing parts that deliver fuel, air and electricity to the motor's cylinders.    When the engine does not get the proper mixture, or the proper timing of delivery of the fuel, air and electricity, the engine runs poorly.  One bad component can cause sluggish acceleration, slow starting or stalling.

The ignition system produces a high-voltage electrical charge and transmits it to the spark plugs via ignition wires.  The ignition wires send a charge to each spark plug.  The spark plugs create a spark inside the engine's primary locomotion components - the cylinders.  Each cylinder is fitted with a piston that actuates up and down within the cylinder.  When the piston retracts and leaves an empty cylinder, fuel and air are injected into the cylinder.  When the piston returns and fills the cylinder, a spark from the spark plug ignites the fuel and pushes the piston back to evacuate gases from the cylinder.

The ignition system  produces a high-voltage electrical charge and transmits it to the spark plugs via ignition wires. The charge first flows to a distributor, which you can easily find under the hood of most cars. The distributor has one wire going to its' center and four, six, or eight wires (depending on the number of cylinders) coming out of it. These ignition wires send the charge to each spark plug. The engine is timed so that only one cylinder receives a spark from the distributor at a time.

This approach provides maximum smoothness.