This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and for that reason not compensated for and can lean the engine out and can moreover permit the engine to rev occurring in the manner of not desired causing brusque running. As its a mechanical malformation it tends not to turn on the deviation blithe and you can sometimes listen a hissing noise like 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 little more practically the misfortune history. It currently has a master tech recognized idle expose run valve and tps installed. without heartwarming 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 stirring to date on all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms up and is warmed up? oftentimes in engine work many factors may cause the thesame symptom(s)