1986 190E 2.3 8 Valve Slight Rough Idle

[mctwin2kman]

I have replaced the cap, rotor, plugs, wires, air filter, fuel filter, fuel regulator, set mixture, replaced engine temp sensor, OVP, and I still get a hair of a rough idle. One I can barely feel but feel still the same. Replaced motor mounts and tranny mounts as well. I am at my wits end and wondering if it may be the injectors or EHA or Idle Air Control Valve. IACV seems to be working fine and within spec. EHA when unplugged I feel a change but not smoothing idle out. OVP unplugged pretty much the same as the EHA unplugged. IACV unplugged and idle raises and of course smooths out since it will be idling at 1000RPM instead of 750ish. RPM gauge does not wander at all to indicate idle going up and down. Idle does not seem to wander, just a hair rough.

Thanks,