This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and as a result not compensated for and can thin the engine out and can in addition to allow the engine to rev in the works considering not desired causing scratchy running. As its a mechanical irregularity it tends not to turn on the irregularity light and you can sometimes listen a hissing noise subsequent to the engine running.
Might plus be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can accomplish a quick irregularity find if you unplug the meter and direct the engine without it. if the engine condition is the thesame later chances are the meter or the association to it is faulty. Its after that worth cleaning the MAF sensor wires, as they can acquire coated taking into account dirt over mature which next offsets the reading. Use some contact cleaner or brake cleaner to spray can onto the wires to cut off the dirt on no account touch the wires behind all as they are definitely fragile
I'm reviewing your question now, and will declare help afterward your reply ASAP. Rgds Greg. What defect codes realize you have. Does the engine rule as soon as the MAF disconnected. as soon as the loud hissing hermetic this could be your problem. This could be a large vacuum leak ,with the MAF joined it is on your own measuring the air that is getting similar to the MAF, for that reason if the intake manifold is sucking in air the ventilate to fuel ratio will be totally out and cause the engine to stal