I'm not expert here but my Dad had a clutch in a 91 Dodge with the Cummins in it go bad and he mentioned a rattle/chatter similar to what you are describing. He mentioned that it was caused by the pilot bearing...don't know if this helps, just thought I'd shed what little knowledge I have on this stuff.
Kenny
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The only Carb that matters to me is the one under my hood!
Salem, Oregon
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