This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and thus not compensated for and can lean the engine out and can moreover permit the engine to rev taking place with not desired causing harsh running. As its a mechanical irregularity it tends not to slant upon the deviation buoyant and you can sometimes hear a hissing noise in the same way as 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 more or less the problem history. It currently has a master tech attributed idle ventilate govern valve and tps installed. without touching anything, the last (used) ecu and my original, would govern in the car without this symptom.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you happening 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 take action many factors may cause the similar symptom(s)