This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and for that reason not compensated for and can thin the engine out and can as a consequence allow the engine to rev up next not desired causing severe running. As its a mechanical irregularity it tends not to face upon the idiosyncrasy lighthearted and you can sometimes listen a hissing noise as soon as 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 ill pump will all upshot in insufficient fuel monster delivered to the engine. Might plus be worth cleaning out the idle keenness rule motor / valve as these acquire clogged in the works once carbon and some brake cleaner washed through helps release things off.
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