Rattle noise at 1200 rpm
Most likely the heat shield on the Catalytic converter has rusted off some of the heat shields mounts go underneath the truck and see if you can wiggle the heat shield, if it does thats your problem, This if it's a tinny sounding rattle. If it is a different sound please describe as best you can a deep rattle in the front or rear because anything could rattle like a fender or transmission converter cover. Hope this helps and give me some more information so I can help.
Sounds like you have something loose first track were the noise is coming from and inspect the area for loose componets if it is coming from your motor then you might need a mechanic to check it out could be something loose in there
I believe it is coming from the heat shield strapped around the muffler. I was told GM has a kit to correct this???
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