This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and suitably not compensated for and can thin the engine out and can after that permit the engine to rev taking place subsequent to not desired causing harsh running. As its a mechanical irregularity it tends not to slope upon the oddity fresh and you can sometimes hear a hissing noise as soon as 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 practically the suffering history. It currently has a master tech ascribed idle ventilate manage valve and tps installed. without disturbing 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 related it is without help measuring the freshen that is getting following the MAF, appropriately if the intake manifold is sucking in air the expose to fuel ratio will be unquestionably out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. in the manner of carb cleaner spray can spray can in the place of the hissing bearing in mind the engine government and behind you hear the engine stall or rev far along there is the leak ,could be a bad vacuum hose bad gasket on the manifold.