This could be an airleak after the airflow meter, any expose dragged in here isn t seen by the ECU and thus not compensated for and can lean the engine out and can after that allow the engine to rev happening taking into account not desired causing unfriendly running. As its a mechanical idiosyncrasy it tends not to viewpoint on the idiosyncrasy light 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 under the weather pump will all repercussion in insufficient fuel swine delivered to the engine. Might then be worth cleaning out the idle swiftness manage motor / valve as these get clogged occurring similar to carbon and some brake cleaner washed through helps forgive things off.
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