And at the risk of being stoned myself
I hate to suggest it but perhaps you need to reconsider the water sensor and the resistor you installed?
I've got a list of the output values as they should be if you're interested.
My experience has shown that idle (before moving / driving the car) can be nice and smooth by making sure air idle control valve is working (so disconnect plug - idle goes up to about 1200 to 1500 rpm), making sure the air flow sensor is new without worn tracks, and replacing O2 sensor.
I get the impression that the pressure difference in the upper and lower chambers in the fuel distributor also need to be checked but so far I haven't found the correct adapters to allow me to check this measurement and adjust the hydro-electric actuator (back of fuel distributor).