After reading countless posts on the topic none of the potential fixes did anything for my 86 NA fc. At 3800 rpm under load (revving in neutral/ less than 10% throttle doesn't count as load and will only use primary injectors) my car would almost entirely stop accelerating and would have just enough torque to accelerate in 3rd or lower. I tried entirely unplugging my secondaries and that was the brick wall experience you hear about. While probing the injector connectors for 12v I noticed my rear secondary injector connector pins were backed out. This of course caused one rotor to function and the other to entirely lean out hence the little bit of acceleration I had. So if you have tried it all and still hit a wall/ super hesitation at 3800 and up check one or both of those if you have a crap harness like I do. Let me know if any of you have even heard of this before.