There is no real tune-up since computer controlled vehicles.
Tune up use to mean replace spark plugs, set dwell, adjust points and ignition timing, set mixture, idle, etc.. Now some of these functions are taken over by sensors and computers and no adjustments necessary or possible.
What has to be done in these "modern times" is maintaining the right conditions for the computer and the drive train to do its job correctly, this is what's called the Manufacturer's Suggested Maintenance or Scheduled Maintenance.
I guess "tune-up" will stuck with us, however the meaning is different now.
Zee