M1008 funny sound when letting off throttle

[iacucv]

On my way home from work today, all was running well until I turned onto the gravel to my house. When letting completely off the throttle there was a wuh wuh wuh sound that was low and fairly powerful, sounded like some kind of exhaust leak close to the engine since it was very rhythmic. The sound went away when I gave it some throttle. I pulled over and popped the hood and killed it. Didnt see anything out of the norm. After sitting for a minute I fired it back up and heard nothing. Limped the remaining mile home and let it idle, gave some throttle, could not recreate the sound which I heard several times. Any thoughts or suggestions on what this could be?

 

[doghead]

Throttle cable touching the hood or air cleaner loose and vibrating on the intake.

 

[iacucv]

Ah Doghead you're making me feel much better, just had a water pump grenade I'm glad to hear it could well be something silly. No issues or noise today in the snow, ill look and see if those are the issue. Thanks!