So most of the time at WOT my Evo will hit the numbers it should be (12ish coming down to 10.9ish around redline) but sometimes it will run a full unit richer than the target AFR. The only code I have had come up is VSS (vehicle speed sensor). I was certain that couldn't be the issue but I have replaced so many components and I recently saw someone say replacing their VSS fixed a similar issue. Does anyone else have any experience with this kind of situation, and have a possible fix?