my car's idle speed is set *600 rpm but sometimes it goes up to 1000rpm and stays there. minsan pag ni-off ko yung engine then ni-start ko ulit, nasa 600rpm yung idle speed pero once na ni-rev ko yung engine, babalik uli sa 1000rpm and di na bumababa. aircon on or off, alang diff. what could be the prob? car is ae92, 4-af all stock.


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