I am getting a metallic rattling noise and I can't pinpoint exactly where it's coming from. Sometimes it does it while idling, sometimes around 20-25 mph, there is no real rhyme or reason when it happens. I posted about it a while back and got some pretty good suggestions. I checked to see if I could find anything loose that might be vibrating and found nothing. I was doing some research on the ole Google and saw where some people said to check the pulleys, specifically the idler pulleys. I am just wondering if anyone else has had this problem or had to replace any pulleys? It comes and goes, and doesn't get worse under load or acceleration. Thanks in advanced for any help.