Odd engine intake noise on acceleration 4.6

[n_tesla]

My 2011 4.6 makes a "waahh" sound when accelerating lightly from a stop at 1300-1800 rpm. I can make it go away by stepping harder on the throttle. Passengers ask "what's that noise" so it's not just me. It's not the cool intake noise of a high performance engine. It's a something's broken sound. Nothing appears loose or disconnected in the engine compartment. Thoughts?

 

[Dawg]

Any chance you could drive in manual mode and keep the rpm's in that range in first or second gear? If it still makes the noise, definitely take the car in since it can be duplicated