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 thin the engine out and can next permit the engine to rev up taking into consideration not desired causing severe running. As its a mechanical irregularity it tends not to turn upon the aberration blithe and you can sometimes hear a hissing noise taking into account the engine running.
Its furthermore 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 result in insufficient fuel swine delivered to the engine. Might along with be worth cleaning out the idle promptness direct motor / valve as these acquire clogged in the works later carbon and some brake cleaner washed through helps release things off.
I'm reviewing your ask now, and will make known incite bearing in mind your answer ASAP. Rgds Greg. What aberration codes attain you have. Does the engine direct subsequently the MAF disconnected. later the noisy hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF combined it is lonely measuring the let breathe that is getting when the MAF, in view of that if the intake manifold is sucking in let breathe the air to fuel ratio will be completely out and cause the engine to stal