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This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and thus not compensated for and can thin the engine out and can afterward allow the engine to rev stirring with not desired causing scratchy running. As its a mechanical malfunction it tends not to face upon the defect spacious and you can sometimes listen a hissing noise later 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 just about the difficulty history. It currently has a master tech endorsed idle ventilate manage valve and tps installed. without touching anything, the last (used) ecu and my original, would control in the car without this symptom.
This could be a large vacuum leak ,with the MAF combined it is lonesome measuring the let breathe that is getting later than the MAF, fittingly if the intake manifold is sucking in expose the let breathe to fuel ratio will be entirely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. with carb cleaner spray can spray can in the place of the hissing with the engine supervision and in the manner of you hear the engine stall or rev vanguard there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.