Is the ECU standard, I'm surprised it doesn't struggle to be honest as you have changed quite a lot. What about the exhaust ?
I don't know how the mixture reacts on a normal car but seems a bit extreme to go from normal to weak. My old favourite the injector relay located in the engine bay, wonder if an intermittent connection would cut fuel to the injectors.
Thats why I suggested checking the plugs, very clean or normal would indicate a lack of fuel, sotty might be too much fuel or no spark.
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