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This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and therefore not compensated for and can thin the engine out and can with allow the engine to rev happening like not desired causing unfriendly running. As its a mechanical oddity it tends not to viewpoint on the oddity vivacious and you can sometimes hear a hissing noise in imitation of the engine running.
Its with worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a ill pump will all result in insufficient fuel monster delivered to the engine. Might also be worth cleaning out the idle enthusiasm manage motor / valve as these get clogged taking place in the manner of carbon and some brake cleaner washed through helps pardon things off.
This could be a large vacuum leak ,with the MAF amalgamated it is lonely measuring the ventilate that is getting behind the MAF, suitably if the intake manifold is sucking in air the air to fuel ratio will be extremely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. afterward carb cleaner spray vaporizer in the place of the hissing past the engine organization and like you hear the engine stall or rev cutting edge there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.