Check for trouble codes.
Change plugs - DENSO or NGK brands.
Clean intake
Clean EGR valve.
Check your ignition timing. Check your timing belt, it may be off a tooth on a cam sprocket.
Check for restrictions in the exhaust. Bent exhaust or tail pipe. Crushed or internally corroded muffler.
Check the fuel flow and pressure at the fuel rails. Check for bent/crimped fuel lines. Replace the pump or fuel pressure regulator to fix flow or pressure problem, respectively.
Have your injectors cleaned.
(Are you sure you needed all those parts? Someone may be taking someone for a ride.)