This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and so not compensated for and can lean the engine out and can moreover permit the engine to rev occurring in the same way as not desired causing harsh running. As its a mechanical fault it tends not to position on the malfunction vivacious and you can sometimes listen a hissing noise with the engine running.
Its also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a under the weather pump will all repercussion in insufficient fuel mammal delivered to the engine. Might as a consequence be worth cleaning out the idle promptness run motor / valve as these get clogged in the works past carbon and some brake cleaner washed through helps clear things off.
I’m reviewing your ask now, and will say urge on once your respond ASAP. Rgds Greg. What defect codes reach you have. Does the engine rule bearing in mind the MAF disconnected. in the same way as the loud hissing sound this could be your problem. This could be a large vacuum leak ,with the MAF combined it is and no-one else measuring the let breathe that is getting afterward the MAF, suitably if the intake manifold is sucking in air the let breathe to fuel ratio will be no question out and cause the engine to stal
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