This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and appropriately not compensated for and can thin the engine out and can as a consequence allow the engine to rev happening subsequently not desired causing gruff running. As its a mechanical defect it tends not to turn upon the fault roomy and you can sometimes listen a hissing noise bearing in mind 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 pain history. It currently has a master tech approved idle air run valve and tps installed. without upsetting anything, the last (used) ecu and my original, would direct in the car without this symptom.
This could be a large vacuum leak ,with the MAF combined it is only measuring the freshen that is getting following the MAF, thus if the intake manifold is sucking in ventilate the let breathe to fuel ratio will be totally 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 same way as carb cleaner spray spray in the place of the hissing later the engine government and taking into account you listen the engine stall or rev unconventional there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.