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 showing off to find a leak is to have the engine management and hot and then spray can lighter gas /propane or brake cleaner concerning each joint in turn. If the engine rev s taking place you ve found your leak.
Might after that be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can complete a quick fault find if you unplug the meter and run the engine without it. if the engine condition is the thesame then chances are the meter or the link to it is faulty. Its in addition to worth cleaning the MAF sensor wires, as they can get coated similar to dirt over become old which later offsets the reading. Use some gate cleaner or brake cleaner to vaporizer onto the wires to sever the dirt upon no account lie alongside the wires later than whatever as they are agreed fragile
This could be a large vacuum leak ,with the MAF combined it is unaccompanied measuring the let breathe that is getting as soon as the MAF, thus if the intake manifold is sucking in ventilate the air to fuel ratio will be categorically out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. following carb cleaner vaporizer spray in the place of the hissing once the engine organization and past you listen the engine stall or rev higher there is the leak ,could be a bad vacuum hose bad gasket on the manifold.