Gurgling/Sputtering noise on idle or when accelerator is not being touched

[medve]

Hi guys,
Longtime lurker but first time poster here. I have a 2013 mazda 3 that ive been driving for the past 4 months with about 5k on it. Recently its been starting to make this kind of gurgling/sputtery noise when the car is idle or when the gas isnt being touched(at a light etc.). Im trying to figure out what this could be before i go see a mazda tech. The car is new, no mods so id really like to know what this could be.
Thanks a lot in advance.

[FD22]

Any specific circumstances that this happens under? ie colder temps, when first starting, etc

Any chance you've got a video/sound clip of what's going on?

[MazdaMike02]

Check the belt tensioner. Use a stethescope, or a screwdriver as one.