This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and so not compensated for and can thin the engine out and can next permit the engine to rev up next not desired causing rasping running. As its a mechanical anomaly it tends not to viewpoint on the irregularity fresh and you can sometimes hear a hissing noise later than 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 virtually the suffering history. It currently has a master tech approved idle freshen control valve and tps installed. without upsetting anything, the last (used) ecu and my original, would run in the car without this symptom.
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