This could be an airleak after the airflow meter, any expose dragged in here isn t seen by the ECU and therefore not compensated for and can thin the engine out and can afterward permit the engine to rev occurring considering not desired causing scratchy running. As its a mechanical irregularity it tends not to position on the defect roomy and you can sometimes listen a hissing noise taking into consideration 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 tiny more more or less the burden history. It currently has a master tech ascribed idle ventilate control valve and tps installed. without moving anything, the last (used) ecu and my original, would manage in the car without this symptom.
This could be a large vacuum leak ,with the MAF linked it is and no-one else measuring the air that is getting in imitation of the MAF, consequently if the intake manifold is sucking in air the ventilate to fuel ratio will be completely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. gone carb cleaner spray can spray in the place of the hissing in the manner of the engine management and later you hear the engine stall or rev innovative there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.