Hi Duke.

What country? What's the year and mileage reading?
my country us UAE. my model is 89 and milage reading is 175000KM.

Is the emission control system OE or added on? If the car has a Lambda system it should have an O2 sensor and three way catalyst. Does it?
I don't know but one thing that my catallystic converter is removed from the exhaust pipe. It has an O2 sensor. the car is a german spec.

I assume the test was done at idle? Does your car require emission testing to be registered, or were the emission numbers taken purely for diagnostic use?
yes this test was done at idle, and it requires emission testing for registration. My idea to adjust the mixture was to reduce the fuel consumption as it was very poor. I am not sure about the fuel economy now but the power has been reduced a lot as i noticed it by weaker acceleration than before, and before this adjustment it used to go 195KM/h and now it doesn't cross 170KM/h.

are the emission readings correct or shall I ask the specialist to redo it. what should be the optimal readings.

thanks