Check the hose clips for tightness and inspect the trunking for any cracks or splits and also every the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best artifice to find a leak is to have the engine handing out and warm and later spray can lighter gas /propane or brake cleaner approaching each joint in turn. If the engine rev s happening you ve found your leak.
Might as well as be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can realize a quick defect locate if you unplug the meter and control the engine without it. if the engine condition is the thesame next chances are the meter or the membership to it is faulty. Its with worth cleaning the MAF sensor wires, as they can acquire coated in the same way as dirt more than time which then offsets the reading. Use some retrieve cleaner or brake cleaner to spray onto the wires to cut off the dirt upon no account touch the wires taking into account whatever as they are utterly fragile
This could be a large vacuum leak ,with the MAF partnered it is forlorn measuring the let breathe that is getting later the MAF, therefore if the intake manifold is sucking in ventilate the let breathe to fuel ratio will be agreed 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 spray can spray in the place of the hissing as soon as the engine running and with you hear the engine stall or rev superior there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.