nagchecheck engine siya and minsan wala naman. Kapag nakapatay un check engine ang ganda umatak and pino umandar pero kapag nakabukas check engine wala gaanong hatak and mausok ng itim sa exhaust. Bkit ganon? do i change my servo? i cost 7 thousand pesos and if I change it would my problem be fix?
Natune-up na ba recently ang kotse? Make sure na malinis ang air filter element at bago ang oil at oil filter. Consider cleaning the MAF (mass airflow sensor) and also the IACV (idle air control valve or servo).
servo is used to control the engine rpm/speed at idle. looks like you are running rich mixture. better have the check engine code read out with the diagmostic tool