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where is it exactly coming from? this might sound too obvious but do you have aftermarket intake? because mine does that but i have ebay intakes though. on cold start the idle is high so it will suck more air and when its warm the idle is where it should be and maybe thats why you dont hear it when its warm already.
plus i dont think its as bad as mine. i have a weird noise something like its hitting the valve covers or something below 1800 rpm and after that it will run smooth.
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