>>any clues what that may be?
It's simply an empty chamber in the inlet manifold. It cannot be the cause of the misfire unless it is BOTH downstream of any air flow measurement or throttle vavle AND has a hole or leak in it.
The resonantor is a device to reduce inlet noise, the combination of the volume of the chamber and the size of the pipe into it combine to tune the device to work at a given frequency - its more scientific name is a Helmholtz resonator.
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