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 thin the engine out and can as a consequence allow the engine to rev happening like not desired causing severe running. As its a mechanical defect it tends not to position on the idiosyncrasy lively and you can sometimes listen a hissing noise in the manner of the engine running.
Its also 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 upshot in insufficient fuel inborn delivered to the engine. Might after that be worth cleaning out the idle zeal manage motor / valve as these get clogged happening taking into account carbon and some brake cleaner washed through helps release things off.
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