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The reason releasing the gas and getting back in it clears the knock is because the ECU is coded to 0 the knock count at 0% throttle. It is still possibly it is the tune at this point, when letting off and getting back on it, the boost/timing curve does not make a knock event when the boost comes back.
If you want to know if it's real knock or not, turn the boost down a little and put in 116 octane and see what happens. If that takes care of the problem then it's a tuning problem.
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-Dave
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