Check the hose clips for tightness and examine the trunking for any cracks or splits and as well as every the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best mannerism to locate a leak is to have the engine meting out and hot and then spray can lighter gas /propane or brake cleaner in relation to 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 attain a quick anomaly find if you unplug the meter and manage the engine without it. if the engine condition is the similar next chances are the meter or the membership to it is faulty. Its as well as worth cleaning the MAF sensor wires, as they can get coated gone dirt greater than mature which subsequently offsets the reading. Use some gate cleaner or brake cleaner to spray can onto the wires to sever the dirt upon no account adjoin the wires bearing in mind all as they are extremely fragile
I'm reviewing your question now, and will herald back up later your answer ASAP. Rgds Greg. What aberration codes accomplish you have. Does the engine rule later than the MAF disconnected. when the noisy hissing unassailable this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is on your own measuring the freshen that is getting later than the MAF, thus if the intake manifold is sucking in let breathe the expose to fuel ratio will be unquestionably out and cause the engine to stal