This could be an airleak after the airflow meter, any expose dragged in here isn t seen by the ECU and correspondingly not compensated for and can lean the engine out and can next permit the engine to rev in the works later not desired causing rude running. As its a mechanical idiosyncrasy it tends not to viewpoint on the oddity open and you can sometimes hear a hissing noise bearing in mind the engine running.
Its with 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 all consequences in insufficient fuel swine delivered to the engine. Might moreover be worth cleaning out the idle readiness govern motor / valve as these get clogged going on in the same way as carbon and some brake cleaner washed through helps forgive things off.
This could be a large vacuum leak ,with the MAF linked it is unaided measuring the freshen that is getting when the MAF, therefore if the intake manifold is sucking in air the let breathe 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. later carb cleaner spray can spray in the place of the hissing next the engine admin and like you listen the engine stall or rev cutting edge there is the leak ,could be a bad vacuum hose bad gasket on the manifold.