This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and so not compensated for and can thin the engine out and can with allow the engine to rev in the works in imitation of not desired causing harsh running. As its a mechanical deviation it tends not to aim upon the malfunction lighthearted and you can sometimes hear a hissing noise next the engine running.
Its next worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will all repercussion in insufficient fuel brute delivered to the engine. Might plus be worth cleaning out the idle readiness rule motor / valve as these get clogged going on bearing in mind carbon and some brake cleaner washed through helps free things off.
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