Engine Hesitant
 

I do have you in the accent 2011 and I bought it recently as used. I’m facing problem when I’m driving on the highway on speed limit 100 km. And after I drive it for 50 km even from town to town I start facing engine hesitant and it’s lower the performance with some noise comes from the engine. I asked many people and they told me it’s from the air flow sensor. My car doesn’t have the air flow sensor in the air intake so what is that problems comes from ?
Thank you