buzzin when slowing down

[sleepintalon]

hey guys well heres the problem, when i slow down, even with the brakes not applied i get a very annoyin buzzin sound. when i do apply the brakes it usually goes away. it sounds like its comin from the engine. it only happens when i slow down so its hard to really go in the engine and get more details on the exact spot. any ideas would be appreciated
thanks

 

[BISHILVR]

are you auto?? if so don't worry bout it.

 

[sleepintalon]

yeah its auto, its just annoyin. i hate havin extra noises like that when i drive