Check the hose clips for tightness and inspect the trunking for any cracks or splits and furthermore all the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best way to locate a leak is to have the engine running and warm and subsequently spray can lighter gas /propane or brake cleaner nearly each joint in turn. If the engine rev s stirring you ve found your leak.
Might then be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can pull off a quick deviation locate if you unplug the meter and govern the engine without it. if the engine condition is the same 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 considering dirt higher than time which next offsets the reading. Use some gate cleaner or brake cleaner to spray onto the wires to surgically remove the dirt upon no account be adjacent to the wires similar to everything as they are categorically fragile
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