My 08 is running great, but when I come to a stop I get a weird noise. Maybe the last five feet or so. It's kind of a whistling sound. Really quiet. Sounds kind of like the sound they make when wiley coyote falls or maybe like birds singing if they only knew one note. Sounds kind of like the gas cap whistle when it is full and sitting in the sun. I am 99% sure it's not the brakes. It's really quiet, so I can't pinpoint it. Any ideas?