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Reviving an old thread because I'm having exact same issues and they seem unresolved.
Same issue here with my 14 BRZ. Misfires will accumulate on cylinder 2 like crazy. After driving awhile, then coming to a stop and idling it will start misfiring like crazy. Sometimes suddenly a change and it smoothes out and no misfires for the remainder of the drive.
Tried replacing spark plug, coil pack, direct injector. Nothing solves it. Have not looked at the hpfp pressures though......
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