I am really new and i am not a car guy all though i am trying to learn. I have a 2003 gp gt with 140,000 kms on it and i need to do a full tune up on it. I need some help because i have no idea where to start or what products i should buy. I know i need to change my plugs and wires and also my pcv valve and air filter. Any other suggestions would be greatly appreciated. Also suggestions of brand names would be great. Thanks to everyone for your help.