Check the hose clips for tightness and examine the trunking for any cracks or splits and along with every the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best pretension to find a leak is to have the engine processing and hot and after that spray lighter gas /propane or brake cleaner approaching each joint in turn. If the engine rev s stirring you ve found your leak.
Might along with be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can complete a fast defect locate if you unplug the meter and run the engine without it. if the engine condition is the thesame next chances are the meter or the attachment to it is faulty. Its afterward worth cleaning the MAF sensor wires, as they can acquire coated next dirt over grow old which after that offsets the reading. Use some contact cleaner or brake cleaner to spray onto the wires to separate the dirt upon no account adjoin the wires subsequently everything as they are enormously fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you occurring 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 taking place and is warmed up? oftentimes in engine con many factors may cause the similar symptom(s)