Check the hose clips for tightness and inspect the trunking for any cracks or splits and next every the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best way to locate a leak is to have the engine admin and warm and subsequently vaporizer lighter gas /propane or brake cleaner more or less each joint in turn. If the engine rev s occurring you ve found your leak.
Might in addition to be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can reach a fast fault locate if you unplug the meter and rule the engine without it. if the engine condition is the thesame next chances are the meter or the link to it is faulty. Its furthermore worth cleaning the MAF sensor wires, as they can acquire coated later dirt higher than grow old which subsequently offsets the reading. Use some open cleaner or brake cleaner to spray onto the wires to surgically remove the dirt on no account adjoin the wires in the same way as whatever as they are extremely fragile
I'm reviewing your question now, and will state support behind your respond ASAP. Rgds Greg. What deformity codes realize you have. Does the engine direct afterward the MAF disconnected. subsequent to the loud hissing sound this could be your problem. This could be a large vacuum leak ,with the MAF joined it is deserted measuring the expose that is getting as soon as the MAF, consequently if the intake manifold is sucking in ventilate the air to fuel ratio will be very out and cause the engine to stal