Check the hose clips for tightness and examine the trunking for any cracks or splits and plus every the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best artifice to find a leak is to have the engine processing and warm and next vaporizer lighter gas /propane or brake cleaner almost each joint in turn. If the engine rev s happening you ve found your leak.
Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can get a fast irregularity find if you unplug the meter and rule the engine without it. if the engine condition is the thesame next chances are the meter or the membership to it is faulty. Its next worth cleaning the MAF sensor wires, as they can get coated in the manner of dirt exceeding become old which then offsets the reading. Use some read cleaner or brake cleaner to spray onto the wires to surgically remove the dirt upon no account lie alongside the wires with anything as they are extremely fragile
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