When i got my MAS code on the Scanner, it was accurate, However i do not think the misfire is related to the MAS code, I think maybe that misfire could have been a result of your boost leak you had OR maybe the mixture is getting too hot and your getting detonation and in that case i would recommend a colder spark plug...denso iriduims are awesome and autozone usually keeps them in stock.
If you pulling an o2 sensor code i think they were just about on there way out and the added heat exhaust gases from the supercharger may have helped in them failing. You may need all 3 things replaced.
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