Very Noisy when driving

I recently noticed that my 01 Rodeo is loud when statring out. It almost sounds like the air cleaner is off when I start off. I've looked everywhere and nothing is lose but it sounds loud. Is there a way to quiet this down or is it a characteristic of all Rodeo's:runaround:

Does it sound like like your clutch fan is always engaged?

Does it sound like like your clutch fan is always engaged?
No the sound is a very throaty sound like if I was running the car without an air cleaner.When I step on the gas I get the noise like reving the car without an air cleaner box. :confused:

If you have a phone or camera, take a short video and upload it to youtube .....