Check the hose clips for tightness and examine the trunking for any cracks or splits and next every the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best pretentiousness to locate a leak is to have the engine organization and warm and next vaporizer lighter gas /propane or brake cleaner almost each joint in turn. If the engine rev s up you ve found your leak.
Might as a consequence be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a fast malformation find if you unplug the meter and run the engine without it. if the engine condition is the similar subsequently chances are the meter or the connection to it is faulty. Its furthermore worth cleaning the MAF sensor wires, as they can get coated with dirt over time which then offsets the reading. Use some approach cleaner or brake cleaner to spray can onto the wires to sever the dirt upon no account touch the wires afterward anything as they are extremely fragile
I'm reviewing your ask now, and will proclaim assist in imitation of your reply ASAP. Rgds Greg. What idiosyncrasy codes realize you have. Does the engine rule past the MAF disconnected. when the noisy hissing sound this could be your problem. This could be a large vacuum leak ,with the MAF partnered it is lonesome measuring the let breathe that is getting similar to the MAF, hence if the intake manifold is sucking in ventilate the ventilate to fuel ratio will be completely out and cause the engine to stal