Check the hose clips for tightness and examine the trunking for any cracks or splits and then all the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best mannerism to find a leak is to have the engine processing and hot and subsequently spray can lighter gas /propane or brake cleaner going on for each joint in turn. If the engine rev s in the works you ve found your leak.
Might plus 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 after that chances are the meter or the link to it is faulty. Its plus worth cleaning the MAF sensor wires, as they can get coated in imitation of dirt over period which next offsets the reading. Use some gate cleaner or brake cleaner to vaporizer onto the wires to separate the dirt on no account be next to the wires afterward everything as they are entirely fragile
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