Refresh car with some lost power and milage?

good reply just to add i would stick with ngk wires nothing else,if you dont drive it in the winter u can also put in a 1wire ngk o2 sensor,you dont need to use 10/40 oil in the car, if you dont want to use a synthetic just run castrol 10/30 and yes if you drive the car hard do all other regular maintenance every yeah. as for filters i know the k&n`s work good