This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and consequently not compensated for and can thin the engine out and can furthermore allow the engine to rev up in the same way as not desired causing rasping running. As its a mechanical deformity it tends not to slant on the deformity open and you can sometimes listen a hissing noise as soon as the engine running.
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Its as well as 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 upshot in insufficient fuel swine delivered to the engine. Might as a consequence be worth cleaning out the idle swiftness control motor / valve as these get clogged going on subsequently carbon and some brake cleaner washed through helps release things off.
This could be a large vacuum leak ,with the MAF similar it is lonely measuring the ventilate that is getting with the MAF, hence if the intake manifold is sucking in air the ventilate to fuel ratio will be completely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. subsequently carb cleaner vaporizer spray can in the area of the hissing with the engine management and similar to you listen the engine stall or rev well along there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
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