I am posting this for my buddy. It is a 04 STI with 75k on it. Has short ram intake, turbo back, fmic, vented bov ( yes i know this is bad but he wont listen). Cobb stage 2 sti tune.
It runs very rough and very rich and throws code for missfire in cyl # 1, 2, 4. Any ideas as to what it could be he tried switching back to stock map, and resetting ecu. No luck.