Hello, I have repaired over 30000 vehicles in my career and I infatuation to ask you questions before I am not there in person to assemble facts, data, or to exam your vehicle. I may question you to performance investigation in my stead. If testing is needed and you would rather not doing testing, I can manage to pay for my best advice, Fuel pressure?
Its with 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 outcome in insufficient fuel being delivered to the engine. Might also be worth cleaning out the idle speed rule motor / valve as these acquire clogged taking place afterward 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 in the works 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 feign many factors may cause the thesame symptom(s)