This could be an airleak after the airflow meter, any expose dragged in here isn t seen by the ECU and for that reason not compensated for and can lean the engine out and can along with permit the engine to rev occurring following not desired causing harsh running. As its a mechanical idiosyncrasy it tends not to position upon the irregularity light and you can sometimes listen 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 say you a tiny more just about the misery history. It currently has a master tech approved idle ventilate control valve and tps installed. without touching anything, the last (used) ecu and my original, would run in the car without this symptom.
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