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Have you tried to clean out throttle body?
Did misfire and P0455 come around the same time?
EGR code is gone now? Does how much fuel is in tank seem to effect misfire at all?
Remove purge valve and block off lines, let me know if this allows it to run better. This is only thing that would cause p0455 to be related to misfire. Let me know, thanks.
Ever get it figured out? Thanks