Curious as to what fuel pump/pickup you guys are both running?
Some flatbrim moron had violated my gc8 prior to me picking it up and it had issues very similar to what was described above.
I always start at the beginning with problems like these, in this case that's the fuel pump. Said flatbrim had said he had upgraded it.. We will see about that. As soon as I pulled it I was 95% confident that I'd found the problem. Aftermarket fuel pump pickup, a huge no no on wrx's.
Sourced a gd sti replacement pump and assembly, no more hunting, no more surge and no more missfires. This thing would surge on mountain runs with over 3/4 of a tank.
Bottom line, if you upgrade pump keep the factory pickup.
Old pump left, sti item on the right.
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