Check the hose clips for tightness and examine the trunking for any cracks or splits and afterward all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best quirk to locate a leak is to have the engine management and warm and then vaporizer lighter gas /propane or brake cleaner in the region of each joint in turn. If the engine rev s in the works you ve found your leak.
Might as a consequence be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can realize a quick anomaly locate if you unplug the meter and run the engine without it. if the engine condition is the similar then chances are the meter or the attachment to it is faulty. Its along with worth cleaning the MAF sensor wires, as they can get coated as soon as dirt on top of era which later offsets the reading. Use some entrance cleaner or brake cleaner to spray onto the wires to cut off the dirt upon no account touch the wires subsequent to anything as they are categorically fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you up 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 stirring and is warmed up? oftentimes in engine put on an act many factors may cause the thesame symptom(s)