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Well it sounds like you have covered everything ignition related for sure. With it just happening in 2 cylinders, I would agree with shane on the possibilty of a head gasket or something similar. Maybe do a leak down test on all the cylinders and compare at high pressure levels to see if something is leaking under boost. Maybe the head bolts are stretching enough under pressure to allow a leak only after you are over 20 PSI.
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