96 Accord RPM flux??

I need some help figuring out this RPM flux problem on my wifes 96 Accord V-6. The RPM needle bounces between 0-4000 without any rythm and only with the flux comes a small but constant surge in the car(not enough to effect the speedo) and there is no audible change in engine noise. This happens at all speeds but not all the time. No ck engine light or codes while driving & having this problem. I have R2 the cap, rotor, plugs, wires, timing belt & fuel filter with no luck! Any help or suggestions would be great!!

FYI It was the ignition coil!?