Hey everyone, I have been doing some searching but I still feel the question I have has not been directly answered. Im running a 93 ls400 1uz in my 91 hilux. Im running the factory ecu. With everything plugged in the truck runs pretty good but at around 3800rpm at it seems to gain noticeable power all the way up to redline. When I unplug the AFM the truck has amazing power from way down low all the way to redline, it feels much smoother and seems to run better. Aside from it running rich. So far I have Adjusted the TPS, replaced the water temp sensor, cleaned the primary o2 sensors, tested the AFM, replaced the caps in the ECU.. nothing seems to help. Now I am currently running no sub 02 sensors and no EGR, so the ecu usually has three codes for those. My question is, what sensors are ignored once the AFM is unplugged? Something must be pulling alot of timing out because this is a very noticeable amount of power being lost/gained. Any suggestions from the veteran 1uz people out there?