Try tukar gear kat Throtle body tu..mungkin gigi dah haus atau thread dia..cost just arround RM50. Tapi kalau Thread dah haus kira throtle body dah kondem. Tapi boleh by pass pakai Toyota FIEC punya switch. Connect kat A/cond compressor sure dia tak drop kalau bukak A/cond. Pasal kita boleh adjust engine RPM kat switch tu bila A/cond on.