This could be an airleak after the airflow meter, any expose dragged in here isn t seen by the ECU and suitably not compensated for and can thin the engine out and can along with allow the engine to rev stirring next not desired causing rough running. As its a mechanical irregularity it tends not to tilt upon the deformity blithe and you can sometimes listen a hissing noise taking into account the engine running.
Its after that worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a in poor health pump will all repercussion in insufficient fuel subconscious delivered to the engine. Might furthermore be worth cleaning out the idle quickness run motor / valve as these get clogged going on like carbon and some brake cleaner washed through helps release things off.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you happening to date on all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms going on and is warmed up? oftentimes in engine bill many factors may cause the thesame symptom(s)