This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and for that reason not compensated for and can lean the engine out and can also allow the engine to rev up with not desired causing severe running. As its a mechanical malformation it tends not to point of view on the fault spacious and you can sometimes hear a hissing noise later the engine running.
Its afterward 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 outcome in insufficient fuel living thing delivered to the engine. Might after that be worth cleaning out the idle enthusiasm direct motor / valve as these get clogged going on past carbon and some brake cleaner washed through helps free things off.
I'm reviewing your question now, and will name assist once your reply ASAP. Rgds Greg. What irregularity codes pull off you have. Does the engine govern gone the MAF disconnected. taking into account the loud hissing sealed this could be your problem. This could be a large vacuum leak ,with the MAF amalgamated it is unaided measuring the air that is getting behind the MAF, fittingly if the intake manifold is sucking in air the air to fuel ratio will be entirely out and cause the engine to stal