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If it was the flywheel you would have all sorts of drivability issues etc...
It could be valve adjustment or you are hearing the injectors pulse maybe. How often do you listen to it with the hood up or why did you recently?
Does the sound increase in tempo with reving the engine or stay constant? Is the A/C on or off while checking this?
Time to turn everything off and listen a little more, maybe low budget you can use a long screw driver held to your ear and touch the metel end to valve cover etc and try to isolate the noise better? Like a stethoscope...
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