Excellent news,

The problem was the oxygen sensor. At idle with a warm engine it would stay at 0.2volt maximum, sometime it would stick a while at 0.08volt. That is measured on the green wire/sensor connection. I left the wires connected to the ECU, only slided the rubber cover to hookup the voltmeter. The digital voltmeter has an input impedance of 10 MegaOhm.

Last friday I took the sensor out for cleaning. I blew compressed air, soaked in lacquer thinner and more compressed air.

After this medecine I took the car for a ride. I did not show any improvement

Saturday morning my younger son was getting married. I was to take him to the ceremonial with the beautifull 1991 (75k km). With my wife we decided it was not the time to get stranded on the way to Montreal. So we took the 1982DL, it is classified as antique car this year. After all we had a good laugh about this; is it not popular to use an antique car at weddings?

This morning I changed the fuel pressure regulator and took a ride(no change). Then I did put on a used oxygen sensor (13034) and I saw right away how it should alternate every one or two seconds. This one goes from 0.06 - 0.08 volts to 0.71 - 0.75 volts. I dont know if it should be closer to 0.2 to 0.5 volts as mentioned but the engine runs much better.

I will buy a new sensor when I get a good price.

I thank all the peoples that took the time to show me the right direction. If I can I will share my experience also.