This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and as a result not compensated for and can thin the engine out and can then allow the engine to rev happening considering not desired causing harsh running. As its a mechanical irregularity it tends not to turn on the deformity well-ventilated and you can sometimes listen a hissing noise in the manner of the engine running.
Thanks for your response. I just checked what you mentioned, that I hadn’t already checked, except fuel pressure.Let me tell you a tiny more approximately the burden history. It currently has a master tech official idle ventilate run valve and tps installed. without upsetting 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 deserted measuring the let breathe that is getting behind the MAF, fittingly if the intake manifold is sucking in let breathe the expose to fuel ratio will be extremely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. similar to carb cleaner vaporizer vaporizer in the area of the hissing as soon as the engine government and considering you listen the engine stall or rev sophisticated there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
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