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thats an easy one guy.
That is INTAKE NOISE is all.
You are hearing the air being sucked in to the carb.
If you got a buddy with a truck or car with a V8 in it,(older vehicle is better for this) have him remove the air intake cover, start the vehicle and pop the gas pedal a few times real good. You will hear a nice throaty sound coming from the air cleaner assembly.
it is nothing to worry about at all.
It is just another source of noise is all.
Carl
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