Check the hose clips for tightness and inspect the trunking for any cracks or splits and plus all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best pretentiousness to find a leak is to have the engine government and warm and after that vaporizer 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 accomplish a quick idiosyncrasy find if you unplug the meter and govern the engine without it. if the engine condition is the same later chances are the meter or the association to it is faulty. Its afterward worth cleaning the MAF sensor wires, as they can acquire coated once dirt on top of become old which then offsets the reading. Use some gain access to cleaner or brake cleaner to spray can onto the wires to surgically remove the dirt on no account touch the wires later than anything as they are extremely fragile
This could be a large vacuum leak ,with the MAF joined it is forlorn measuring the ventilate that is getting subsequently the MAF, consequently if the intake manifold is sucking in air the air to fuel ratio will be definitely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. later than carb cleaner vaporizer spray can in the place of the hissing in imitation of the engine meting out and behind you hear the engine stall or rev highly developed there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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