tune upcost for car described above

Plugs and air filter, oil change is about $275.00

Why do think you need a "tune up"? What is the problem you are planning to resolve? Your car is suggested for spark plugs every 30K miles, transmission/final drive fluid every 15K, timing belt at 105K, not to mention fuel filters, coolant, PCV valve, engine error codes, and more... For plugs, air filter, oil service only, price should be $250 -$300. However, if it doesn't fix your problem nobody will be happy.