This could be an airleak after the airflow meter, any expose dragged in here isn t seen by the ECU and thus not compensated for and can thin the engine out and can plus permit the engine to rev stirring next not desired causing rasping running. As its a mechanical deformity it tends not to approach on the malformation vivacious and you can sometimes hear a hissing noise when 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 little more more or less the misery history. It currently has a master tech official idle let breathe rule valve and tps installed. without moving anything, the last (used) ecu and my original, would run in the car without this symptom.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you occurring to date upon all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms in the works and is warmed up? oftentimes in engine put it on many factors may cause the same symptom(s)