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Are you getting a good blue spark?
Curious about your resistances. What are they for the cables and plugs? I try to keep the total below 8k ohm. I've had a spark plug with much higher resistance than the others, screw up things.
Maybe ignition coil?
You seem to be getting unburnt fuel. So I'm thinking faulty ignition. I've got carbs, but since the 240 FI is common rail, I think the ECU would balance out air-fuel mix entering the cylinders, but then the problem occurs at ignition.
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1980 245 Canadian B21A with SU carb but electronic ignition and M46 trans in Brampton, Ont.
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