when im at wot my car sounds kinda like i have a leak in something....i hear this faint sucking sound...almost like a turbo....but when i hit a bump its more noticable......now my car doesnt run hot....it doesnt seem like ive lost any power....i just hear this sound....and i think i should check it out before its a problem...also im not leaking anything on the ground where i park at night...any ideas would be helpful...thanks...