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So I've tried various searches to try and narrow the possible problems with my cobalt, but I don't think I've found the problem yet. So, I have a manual 2006 cobalt LS, and its almost at 100,000 miles. Now that my car is so old it's starting to make dad noises (random noises guys make as they get older). It just recently started making a new noise a couple of days ago that I can't quite figure out.
When I start the car it runs and sounds the same as it always has. However, when I start accelerating, I can hear a fluttering, almost crickety kind of noise coming from somewhere. If I accelerate passively it's not as loud, but if I accelerate aggressively it gets much louder.
My first thought was maybe the serpentine belt, but it's not really a high pitched squealing sound. I also thought that maybe it could be an exhaust leak, but it only makes the sound while I'm accelerating. I brought the car up to 3000 RPM while idol and no flutter noise occurred.

If anyone else has experienced this or could lead me in a possible direction as to a starting point where I can get this fixed, it would be much appreciated!
 
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