Mine made a sound like this; it was coming from the air in-take box. The top was not closed all the way, some of the clips are missing from it. Most likely not the same sound that yours is making but you might want to check.
"I guess of all my uncles, I liked Uncle Cave Man the best. We called him Uncle Cave Man because he lived in a cave and because sometimes he'd eat one of us. Later on we found out he was a bear"
http://www.cardomain.com/ride/586498/1
