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best thing to do is process of elimination. i remember in my 95 v6 with the bose system, i had the same interference consistent with the engine speed. it was very slight and when i turned it up, you wouldn't hear it. i only heard it from the passenger front speaker though. ended up being the amp before the speaker in the actual door panel on its way out. $500+ from gm so that never got fixed.
check your wires though and make sure a screw isn't pinching somewhere, maybe off of the metal bracket?
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