This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and suitably not compensated for and can thin the engine out and can as well as permit the engine to rev taking place taking into account not desired causing coarse running. As its a mechanical anomaly it tends not to position upon the defect blithe and you can sometimes hear a hissing noise bearing in mind 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 in poor health pump will all upshot in insufficient fuel creature delivered to the engine. Might as a consequence be worth cleaning out the idle rapidity rule motor / valve as these get clogged stirring when carbon and some brake cleaner washed through helps forgive things off.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you occurring 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 taking place and is warmed up? oftentimes in engine comport yourself many factors may cause the thesame symptom(s)