This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and hence not compensated for and can thin the engine out and can after that allow the engine to rev going on afterward not desired causing argumentative running. As its a mechanical oddity it tends not to incline on the anomaly light and you can sometimes hear a hissing noise past the engine running.
Its moreover worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a in poor health pump will every consequences in insufficient fuel visceral delivered to the engine. Might as well as be worth cleaning out the idle promptness control motor / valve as these acquire clogged happening bearing in mind carbon and some brake cleaner washed through helps forgive things off.
This could be a large vacuum leak ,with the MAF united it is and no-one else measuring the freshen that is getting taking into account the MAF, for that reason if the intake manifold is sucking in freshen the air 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. subsequent to carb cleaner spray vaporizer in the area of the hissing following the engine management and like you listen the engine stall or rev unconventional there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.