Hi JCF,
I checked logs from msg#5 - it is ok in general.
But i see a spikes on oxygen sensor signal.
Let me know from which point did you take supply ground of the converter?
Also please check ignition system totally - high voltage wires with a multimeter and set spark plug's gap to 0.85-0.9mm .
Also check ground wire from chassis to engine/gearbox. And let me know how much wires goes from oxygen sensor - 1, 2, 3 or 4.
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