Reset your ECU----> remove your (+) pos. battery terminal for 1 hour.

Remove the plug in the MAP sensor it is located on the intake side near the throttle plate----> see if your car runs better. if it does then your injectors maybe dirty.
->Ever change your fuel filter?
->When you get you new wire set and plugs, insist on NGK as recommended in the owners manual. Many people get those so called high perfomance wires and plugs, they cause more problems and don't make more power.

Hopefully you don't get ripped off, many auto techs in the States do that.