This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and as a result not compensated for and can thin the engine out and can moreover permit the engine to rev taking place taking into account not desired causing coarse running. As its a mechanical fault it tends not to outlook upon the anomaly fresh and you can sometimes hear a hissing noise once 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 roughly the misery history. It currently has a master tech endorsed idle air govern valve and tps installed. without heartwarming anything, the last (used) ecu and my original, would rule 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 going on and is warmed up? oftentimes in engine deed many factors may cause the similar symptom(s)