well i replaced the spark-plugs (showed signs of running lean - from past owner, i fixed that problem), PCV valve (it was stuck - wasnt clicking), and fuel filter (was rusted and when the remaining fuel inside was brownish lol) below are some pics..
p.s old plugs and wires were all still from the factory lol
(all 8 plugs)
(Really bad plug)
(plugs and wire-set)