I have been dealing with an almost identical problem to what you initially posted for quite some time now and have replaced plug wires (three times), plugs (twice), fuel filter, cleaned manifolds and tested nearly every sensor and valve that I can think of. I also replaced my coil pack with no success. I have never had any issues with idle or stalling but I do get the misfire/bogging in the same rpm range while under more than roughly half throttle. I hope that one of us runs across something soon that will benefit the other bc I know how frustrating a problem like this is.
