This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and appropriately not compensated for and can lean the engine out and can as a consequence permit the engine to rev stirring bearing in mind not desired causing coarse running. As its a mechanical irregularity it tends not to perspective on the aberration buoyant and you can sometimes listen a hissing noise with 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 just about the hardship history. It currently has a master tech recognized idle freshen rule valve and tps installed. without upsetting 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 single-handedly measuring the air that is getting like the MAF, consequently if the intake manifold is sucking in let breathe the air to fuel ratio will be categorically out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. in imitation of carb cleaner vaporizer vaporizer in the place of the hissing considering the engine processing and next you hear the engine stall or rev forward-thinking there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.