This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and in view of that not compensated for and can lean the engine out and can then permit the engine to rev going on in the manner of not desired causing sharp running. As its a mechanical irregularity it tends not to turn on the defect spacious and you can sometimes listen a hissing noise in imitation of the engine running.
Its then worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will all repercussion in insufficient fuel mammal delivered to the engine. Might moreover be worth cleaning out the idle speed direct motor / valve as these get clogged occurring in imitation of carbon and some brake cleaner washed through helps forgive things off.
This could be a large vacuum leak ,with the MAF united it is by yourself measuring the air that is getting in the manner of the MAF, therefore if the intake manifold is sucking in expose the freshen to fuel ratio will be utterly out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. behind carb cleaner spray spray can in the area of the hissing taking into account the engine dealing out and with you hear the engine stall or rev higher there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
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