I have a 2014 Tucson. I'm hearing what sounds like a metal scraping sound when I accelerate. I first noticed it in the parking garage at my work and basically what happens is when I go to accelerate I hear the noise but I when I let off the gas while the car is still moving and the sound stops. It sounds like it's coming from the front of the car. It does not matter if the car is cold or hot and it does not matter if it has been sitting for a couple of days it happens every time. I do not hear it inside the car I only hear it if the window is down. Once I get to higher speeds I don't hear it but that could be due to the fact of the wind when reaching higher speeds. Any ideas what this might be before I take it to the mechanic?