I disabled everything in the Motronic and threw out the rear lambdas and the EGT system. there are no more problems with "slow down"
I believe that Motronics ECU problem I mentioned earlier was related to the ECU internals, not the wiring to it. That is, how the Motronics ECU processed the temperature signal from the Thermocouple ECU. Since your car's problem disappeared when the car moved, could it have been alternator voltage variations upsetting a faulty ECU? Anyway, the problem seems to have disappeared
I monitored the voltage and all lines were stable power - 13.8v ground - ok Signal - 0.7 and more depends of speed there were no dips or jumps up to 5v, the signal went quite linearly. But I'm glad that I went ahead and turned off all the catalyst monitoring, now I will install the cats and physically remove all sensors from the muffler (except for the first lambda)
