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From my experience misaligned ballance shats cause higher pitch vibrations making the engine sound busy. You can tell something is wrong as the interior trim rattles making the car sound like a banger. As you swapped the head, is possible that the cams are not aligned correctly, or even the cam belt itself is not correctly aligned. When this happens, at idle there is too much air fed back into the inlet upsetting the air flow meter and the car idle badly. Also similar symptoms you can get from a vacuum leak, so recheck your vacuum lines.
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