RE: What does a tune up consist of?
Depends on who you ask. Really today filter are checked so often that if it gets dirty you change it whether or not you do a "TUNE UP" take stock of what you need and how many miles you got on the ride.
30K look into Plugs, Air Filter, Make-Up air filter, PCV Valve, Belts
60K add Wires to the mix
90K probably add the timing belt and idler pulleys/tensioner and water pump and coolant exchange
Now for fuel system stuff I would have you pick-up Redline SI-1 fuel injector cleaner (about as effective as a Fuel Injection Service) about every or every other oil change.
Should do you.