Make sure you used the correct plug, copper core design only. (read that you already have)Since you have changed almost every possible thing that supports the engine management system except the CIS-E unit, try a new coil.... Also get a fuel quage with a "T" fitting, between the fuel delivery line and FPR. You need around 80PSI there constant. You might have carbonization and flaking on top of the pistons causing a rough idle.(They remain glowing after a power stroke and cause uneven burning plus pre ignition problems) Try running a one pint can of Marvel Mystery oil mixed with gumout, (one quart) slowly fed thru fuel plate opening at 3500 rpm. Take your time doing this, maybe 15 mins, do it slowly and dribble it in, change the plugs after set @ .034 and see....
Dave...