What all is involved in doing a tune up on a 2005 Chevy Cobalt

change plugs and air filter.

Now days less and less. But it depends on mileage and age, go buy the maintenance schedule at very least, if its driven hard do those sooner. Oil & Filter, Check all hoses for issues. If its time for fuel filter change it out too.

Check coolant and all fluid levels and change/flush when needed. Basically a tune up used to include a total check of everything while looking for issues, even light bulbs out, belts bad/frayed, loose wires, vacuum lines bad, blown fuses, leaks, you name it check it.

Also scan for trouble codes that may be saved in your computer indicating areas that may require special attention.