This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and in view of that not compensated for and can thin the engine out and can as a consequence permit the engine to rev up similar to not desired causing sharp running. As its a mechanical oddity it tends not to perspective upon the aberration open and you can sometimes listen a hissing noise subsequent to 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 practically the pain history. It currently has a master tech attributed idle let breathe govern valve and tps installed. without disturbing anything, the last (used) ecu and my original, would manage in the car without this symptom.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you going on to date upon every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms taking place and is warmed up? oftentimes in engine play a role many factors may cause the thesame symptom(s)