I have a customer's EVO 9 with a 2.4 4g64 block. It is misfiring at 250 kpa and 5700 rpm. All morotsports options turned off, plugs gaped to .022, tried different plugs as well as ignition coils. Raised and lowered ignition dwell, no change to misfire. It starts, idles, and drives fine, except for misfire under boost. I have also tested the injectors, and had the air fuel from 13.3 to 11.5 and no change. It seems to be hitting a load limit of sorts. It will rev to 8000 rpm without any issues without load. The scaling for the wideband seems to be off one full air fuel ratio point from the working dyno wideband. It's an old school AEM wideband gauge with a 5v out. None of the dropdown scales will read correctly. The dyno wideband was recently replaced, and we have tuned 1000+ whp cars on it without issue. We are also using the internal map sensor.
Log 2018-06-9 1;39;15 am.llg
EVO 9 2.4 idle 1.pclr