P0303 Cylinder 3 Misfire at ~5500rpm

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2008 Subaru Impreza 2.5i, automatic new short block ~2000 miles on the block, 134k on heads and body and trans.
new plugs when block was installed
checked timing twice, good
compression in spec, roughly 180 on all cylinders

only seems to happen under load, not a hard code, CEL flashes for a bit then turns off, pending code stored
set a hard code once

looking for advise on what to check next.
 

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