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Check the hose clips for tightness and inspect the trunking for any cracks or splits and then every the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best pretentiousness to find a leak is to have the engine giving out and warm and after that vaporizer lighter gas /propane or brake cleaner just about each joint in turn. If the engine rev s going on you ve found your leak.
Might plus be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick anomaly find if you unplug the meter and manage the engine without it. if the engine condition is the thesame subsequently chances are the meter or the attachment to it is faulty. Its then worth cleaning the MAF sensor wires, as they can acquire coated taking into consideration dirt over mature which subsequently offsets the reading. Use some entre cleaner or brake cleaner to spray can onto the wires to surgically remove the dirt on no account be next to the wires as soon as whatever as they are entirely fragile
I'm reviewing your question now, and will herald put up to in imitation of your answer ASAP. Rgds Greg. What malformation codes realize you have. Does the engine control later the MAF disconnected. as soon as the loud hissing strong this could be your problem. This could be a large vacuum leak ,with the MAF similar it is deserted measuring the ventilate that is getting subsequently the MAF, in view of that if the intake manifold is sucking in air the ventilate to fuel ratio will be certainly out and cause the engine to stal