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did you say it was in gear or neutral? M6 or A8, just at idle? its stretch but..... something off balance on the pully's. or the flywheel or torqconvert. you could try swapping a couple of existing coils to see if theres any perceptible change. You could try just one new coil one plug at a time..
try a auto parts place that will let you get a scan. or, hit up a garage. the peace of mind may be well worth it at this point. could be a clogged or bad injector? get the misfire metrics. anything sound different? carbon on the valves? hows the power been. a good garage would spot it quickly.
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