This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and as a result not compensated for and can lean the engine out and can next permit the engine to rev happening subsequent to not desired causing argumentative running. As its a mechanical aberration it tends not to direction on the anomaly well-ventilated and you can sometimes listen a hissing noise considering 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 every consequences in insufficient fuel visceral delivered to the engine. Might along with be worth cleaning out the idle eagerness govern motor / valve as these get clogged in the works like carbon and some brake cleaner washed through helps pardon things off.
I'm reviewing your ask now, and will declare urge on when your reply ASAP. Rgds Greg. What malfunction codes accomplish you have. Does the engine govern once the MAF disconnected. considering the noisy hissing strong this could be your problem. This could be a large vacuum leak ,with the MAF partnered it is abandoned measuring the ventilate that is getting taking into account the MAF, hence if the intake manifold is sucking in expose the freshen to fuel ratio will be utterly out and cause the engine to stal