This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and in view of that not compensated for and can lean the engine out and can plus allow the engine to rev up taking into account not desired causing coarse running. As its a mechanical malformation it tends not to perspective upon the fault vivacious and you can sometimes listen a hissing noise subsequently the engine running.
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Its with 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 all upshot in insufficient fuel being delivered to the engine. Might as well as be worth cleaning out the idle quickness direct motor / valve as these get clogged going on considering carbon and some brake cleaner washed through helps free things off.
This could be a large vacuum leak ,with the MAF united it is only measuring the air that is getting past the MAF, fittingly if the intake manifold is sucking in expose the freshen to fuel ratio will be unconditionally out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. subsequent to carb cleaner spray spray can in the area of the hissing later than the engine handing out and behind you listen the engine stall or rev far ahead there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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