This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and therefore not compensated for and can lean the engine out and can after that allow the engine to rev stirring bearing in mind not desired causing prickly running. As its a mechanical defect it tends not to slant on the aberration lively and you can sometimes listen a hissing noise taking into account the engine running.
Its along with 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 physical delivered to the engine. Might after that be worth cleaning out the idle swiftness rule motor / valve as these acquire clogged in the works as soon as carbon and some brake cleaner washed through helps release things off.
This could be a large vacuum leak ,with the MAF combined it is isolated measuring the expose that is getting bearing in mind the MAF, appropriately if the intake manifold is sucking in air the ventilate to fuel ratio will be definitely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. later carb cleaner vaporizer spray in the place of the hissing taking into consideration the engine management and later than you listen the engine stall or rev well along there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.