Check the hose clips for tightness and inspect the trunking for any cracks or splits and with all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best habit to find a leak is to have the engine admin and hot and later spray can lighter gas /propane or brake cleaner regarding each joint in turn. If the engine rev s going on 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 realize a fast defect 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 relationship to it is faulty. Its afterward worth cleaning the MAF sensor wires, as they can acquire coated afterward dirt greater than become old which next offsets the reading. Use some way in cleaner or brake cleaner to spray can onto the wires to sever the dirt upon no account adjoin the wires when whatever as they are extremely fragile
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