Frank Reiner,
I really don't know what is going on.
1.O2 sensor works and shows 487mV
2.The EHA measures around 10mA(when I adjust the air mixture screw) but the Duty Cycle stays constant either 20.3%(black on 2 and red on 3 ) or 79.7(when switch red on 2 and black on 3) .Whatever I do - either try to lean or rich the mixture there is no change at all.
With ignition ON Duty Cycle shows 69.8 %.
Engine would still run rough idle up and down and if I press on the gas bogs down but if EHA is disconnected it will improve and would acceleration very well.

Is this an electrical issue?Do I need a new EHA and FD ?I am confused.
Please,help!