Check the hose clips for tightness and inspect the trunking for any cracks or splits and moreover every the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best pretension to locate a leak is to have the engine giving out and warm and then vaporizer lighter gas /propane or brake cleaner with reference to each joint in turn. If the engine rev s going on 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 get a fast idiosyncrasy find if you unplug the meter and manage the engine without it. if the engine condition is the thesame then chances are the meter or the link to it is faulty. Its afterward worth cleaning the MAF sensor wires, as they can acquire coated later dirt beyond era which next offsets the reading. Use some retrieve cleaner or brake cleaner to spray can onto the wires to remove the dirt upon no account touch the wires afterward all as they are categorically fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you happening to date upon 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 exploit many factors may cause the similar symptom(s)