Check the hose clips for tightness and examine the trunking for any cracks or splits and then all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best habit to find a leak is to have the engine admin and warm and later vaporizer lighter gas /propane or brake cleaner more or less each joint in turn. If the engine rev s in the works you ve found your leak.
Might with be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can accomplish a quick fault locate if you unplug the meter and govern the engine without it. if the engine condition is the similar next chances are the meter or the attachment to it is faulty. Its after that worth cleaning the MAF sensor wires, as they can get coated similar to dirt higher than epoch which after that offsets the reading. Use some gain access to cleaner or brake cleaner to vaporizer onto the wires to separate the dirt upon no account be adjacent to the wires subsequently all as they are definitely fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you happening to date on all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms in the works and is warmed up? oftentimes in engine enactment many factors may cause the thesame symptom(s)