So last August I bought a 2015 wrx . It had 30k on it and no mods . I noticed just recently when I come to a light it has a rough idle . I’m also new to these cars . I have owned Mazda rx 7s they have there own set of rules and things that go wrong with that car type. I also have a question of u drive these cars hard so there burn oil and coolant . My from end is also making a buzzing noise but when I turn the heat off it stops in the front end . Sorry for bouncing around just some much in the last month that’s happening . I don’t want anything to happen to this car. I also bought extended warranty with it .