2005 engine tune up
 

what is all done with a full engine tune up?
how much does one cost?
how much should it cost if i just get the spark plugs replaced?

Depends on Miles. These spark plugs have been seizing into the cylinder heads due to the 'bullet' tips on them. HUGE mess. I'm recommending my customers service the plugs (Clean/antiseize) Every 20,000 km (40,000 M?)
Just hope your not too late - Otherwise the head may have to come off.
Definately do the fuel filter, unless you've gone over 100,000 Km on the original - You may kill the pump. Good oil change goes alot further than you think - PCV system contaminates oil with fuel, if you have access to a sniffer, 700 PPM of Hc Requires an oil change, otherwise it's just 5,000 kilometers. (3,600 miles) Transmission fluid @ 55,000 Km, Rear end oil @ 60,000 Km. If the trans fluid is burnt heavily, don't change it. And Fuel injector cleaner used regularly will keep the intake valves clean, especially on these sequential engines. Anything else?