This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and appropriately not compensated for and can thin the engine out and can also permit the engine to rev going on similar to not desired causing argumentative running. As its a mechanical malformation it tends not to face upon the fault vivacious and you can sometimes listen a hissing noise subsequently the engine running.
Its as a consequence worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a below par pump will all result in insufficient fuel being delivered to the engine. Might with be worth cleaning out the idle keenness control motor / valve as these get clogged up in the manner of carbon and some brake cleaner washed through helps free things off.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you up to date on every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms taking place and is warmed up? oftentimes in engine play-act many factors may cause the thesame symptom(s)