This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and for that reason not compensated for and can lean the engine out and can moreover allow the engine to rev taking place once not desired causing rasping running. As its a mechanical irregularity it tends not to twist upon the anomaly blithe and you can sometimes listen a hissing noise taking into account 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 nearly the suffering history. It currently has a master tech official idle let breathe manage valve and tps installed. without distressing 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 partnered it is solitary measuring the ventilate that is getting afterward the MAF, so if the intake manifold is sucking in expose the let breathe to fuel ratio will be certainly 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 vaporizer spray in the area of the hissing like the engine organization and bearing in mind you hear the engine stall or rev complex there is the leak ,could be a bad vacuum hose bad gasket on the manifold.