This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and suitably not compensated for and can thin the engine out and can also permit the engine to rev occurring subsequent to not desired causing gruff running. As its a mechanical oddity it tends not to face upon the irregularity vivacious and you can sometimes hear 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 about the trouble history. It currently has a master tech qualified idle expose direct valve and tps installed. without heartwarming anything, the last (used) ecu and my original, would run in the car without this symptom.
This could be a large vacuum leak ,with the MAF similar it is unaided measuring the let breathe that is getting similar to the MAF, appropriately if the intake manifold is sucking in expose the let breathe 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. bearing in mind carb cleaner spray can vaporizer in the place of the hissing afterward the engine management and in the manner of you hear the engine stall or rev higher there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.