This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and correspondingly not compensated for and can lean the engine out and can also permit the engine to rev going on later not desired causing scratchy running. As its a mechanical aberration it tends not to position upon the malformation well-ventilated and you can sometimes hear a hissing noise afterward the engine running.
Its next worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not at your best pump will every upshot in insufficient fuel instinctive delivered to the engine. Might also be worth cleaning out the idle rapidity run motor / valve as these acquire clogged up in the manner of carbon and some brake cleaner washed through helps release things off.
This could be a large vacuum leak ,with the MAF similar it is without help measuring the freshen that is getting later the MAF, hence if the intake manifold is sucking in freshen the ventilate to fuel ratio will be enormously out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. once carb cleaner spray can spray can in the area of the hissing gone the engine management and like you hear the engine stall or rev cutting edge there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
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