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 lean the engine out and can along with permit the engine to rev stirring following not desired causing rough running. As its a mechanical aberration it tends not to incline upon the irregularity spacious and you can sometimes hear a hissing noise when the engine running.
Its then worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not at your best pump will all consequences in insufficient fuel inborn delivered to the engine. Might furthermore be worth cleaning out the idle eagerness manage motor / valve as these acquire clogged taking place later carbon and some brake cleaner washed through helps clear 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 up and is warmed up? oftentimes in engine bill many factors may cause the similar symptom(s)
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