HELP! wierd noise coming from engine!

[L1ttlebear]

Hello all,
I have a problem that I am hoping someone can help me with.

My car has recently decide that it would start making this funny noise on me. The noise sounds like if you placed a card in a bike spoke. The noise comes from the engine compartment (as far as i can tell) directly in front of the driver. The noise increases in SPEED with an increase in RPMs but increases in VOLUME with the depression of the accelerator peddle. When the car starts i hear the noise so long as the choke is running but once the engine settles in the noise goes away. you can not hear the noise at ALL when the gas is not being pressed, whether the car is moving or not.

Does anyone have any ideas what this could be? :(