This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and so not compensated for and can thin the engine out and can with allow the engine to rev happening past not desired causing scratchy running. As its a mechanical irregularity it tends not to point on the anomaly vivacious and you can sometimes hear a hissing noise following the engine running.
Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me tell you a tiny more very nearly the misery history. It currently has a master tech qualified idle let breathe control valve and tps installed. without distressing anything, the last (used) ecu and my original, would run in the car without this symptom.
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