This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and as a result not compensated for and can thin the engine out and can along with allow the engine to rev in the works gone not desired causing brusque running. As its a mechanical malfunction it tends not to direction on the deviation fresh and you can sometimes listen a hissing noise considering the engine running.
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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 misfortune history. It currently has a master tech qualified idle ventilate govern valve and tps installed. without distressing 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 taking place 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 feat many factors may cause the thesame symptom(s)
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