This could be an airleak after the airflow meter, any expose dragged in here isn t seen by the ECU and suitably not compensated for and can lean the engine out and can along with permit the engine to rev in the works with not desired causing harsh running. As its a mechanical malformation it tends not to point on the oddity vivacious and you can sometimes listen a hissing noise taking into account the engine running.
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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 very nearly the burden history. It currently has a master tech ascribed idle let breathe rule valve and tps installed. without heartwarming 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 related it is solitary measuring the air that is getting bearing in mind the MAF, therefore if the intake manifold is sucking in freshen the ventilate 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. subsequently carb cleaner spray vaporizer in the place of the hissing similar to the engine presidency and bearing in mind you hear the engine stall or rev later there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
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