This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and appropriately not compensated for and can thin the engine out and can as a consequence allow the engine to rev in the works like not desired causing aggressive running. As its a mechanical deviation it tends not to turn upon the irregularity lighthearted and you can sometimes hear a hissing noise taking into account 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 result in insufficient fuel bodily delivered to the engine. Might furthermore be worth cleaning out the idle keenness run motor / valve as these acquire clogged taking place subsequently 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 taking place to date upon every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms stirring and is warmed up? oftentimes in engine perform many factors may cause the same symptom(s)