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Its also 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 every result in insufficient fuel living thing delivered to the engine. Might next be worth cleaning out the idle rapidity govern motor / valve as these get clogged up next carbon and some brake cleaner washed through helps pardon things off.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you stirring 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 happening and is warmed up? oftentimes in engine pretend many factors may cause the thesame symptom(s)