I have a loud rattling sound coming from the belt/pulley area side of the car. The noise goes away anytime I hit the accelerator. It is most loud during idle in drive and if the a/c is on it is slightly lower. The car also has been having a long labored start I think due to the alternator not getting a proper charge due to the belt. I checked the tensioner pulleys on both the main and supercharger belts and both were fine. I can't figure out what pulley is producing this sound. Any help whatsoever? Thanks.