This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and for that reason not compensated for and can lean the engine out and can with allow the engine to rev happening like not desired causing rasping running. As its a mechanical idiosyncrasy it tends not to slant upon the idiosyncrasy vivacious and you can sometimes hear a hissing noise like the engine running.
Its plus worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will every consequences in insufficient fuel beast delivered to the engine. Might next be worth cleaning out the idle rapidity direct motor / valve as these acquire clogged taking place in the same way as carbon and some brake cleaner washed through helps forgive things off.
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