I'm not sure if the noise is normal or not but I just started noticing it since today is basically the first time I have driven with the air conditioner on low and no radio.
Anyways I've noticed that whenever I accelerate whether it's from a dead stop or when I'm cruising down the road and I go to give it gas I hear what sounds like a short burst of air leaking out from somewhere in the engine compartment.
I do have a 2013 eco-boost and I'm not sure if this may be related to the turbos if it's a normal thing or something I should have checked out

 

Anyone..