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interesting. my first thought was the clutch flex line tapping the brake booster.
Is the vacuum steady? 360 beats per minute times a four cylinder is close to idle speed. if the check valve on the booster is silent when one side of the diaphragm is open to atmospheric pressure, the diaphragm will smooth out the pulses intead of the valve. you might place your finger on the check valve to see if you feel the same rate.
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