First check all your spark plugs are tight. To rule thst simple fix out.
I have had this on my 325i and a friend had same on his z3 2.8. It may not solve the emmisions but could cause misfire under load or at higher revs.
I had 1 plug come slightly loose. It did cook/damage the coil pack so had...
I would try and and source a whole new used amp unit rather than solder new componants. A bit easier.
https://www.ebay.co.uk/itm/355251351915?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=SIiimq3tSPO&sssrc=4429486&ssuid=tQffOaIuQxm&var=&widget_ver=artemis&media=COPY
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