Overview: Car Tune-Up
The word is a leftover. A tune-up once meant points, a distributor cap and rotor, a carburetor set by ear and the timing dialed in with a light. None of that exists on a car built this century. The computer handles timing and fuel mixture, and it adjusts them thousands of times on the drive to work.
So what people call a tune-up now is a different job: replacing the ignition and intake parts that genuinely wear, and finding out why the engine runs badly. Spark plugs, ignition coils, the air filter, the fuel filter where the car still has a serviceable one, the crankcase valve, and sometimes a throttle body or injectors that need cleaning.
What brings you in is a symptom. A shake at idle, a stumble when you pull away, hesitation on the highway, hard starting on a cold morning, or fuel economy quietly sliding. Those symptoms have several possible causes, and only one of them is worn plugs. A vacuum leak, one failing coil, a dirty mass airflow sensor and a tired fuel pump all feel similar from the driver's seat.
The state and city lists below will get you to the shops near you. This is work people book when the cold weather arrives and the car starts complaining.
Data verified October 10, 2026
