car problem on 1996 Mitsubishi 3000GT

i have 1996 mitsubishi 3000gt i buy the two weeks ago no check engine tight on after four check engine light come on code is throotle possition sensor i change it after that the check engine light come back again code said idle air control valve i change it in did a turn up at the same time the check engine light come on code egr now i dont no what todo i only claire it out cant find the causes

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