This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and so not compensated for and can thin the engine out and can next permit the engine to rev going on afterward not desired causing harsh running. As its a mechanical anomaly it tends not to outlook upon the deformity vivacious and you can sometimes hear a hissing noise bearing in mind the engine running.
Might along with be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can complete a fast malfunction locate if you unplug the meter and control the engine without it. if the engine condition is the similar next chances are the meter or the relationship to it is faulty. Its as well as worth cleaning the MAF sensor wires, as they can get coated past dirt exceeding time which next offsets the reading. Use some approach cleaner or brake cleaner to vaporizer onto the wires to separate the dirt on no account adjoin the wires in the same way as whatever as they are unquestionably fragile
I'm reviewing your question now, and will pronounce help following your reply ASAP. Rgds Greg. What defect codes get you have. Does the engine govern taking into consideration the MAF disconnected. past the noisy hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF amalgamated it is lonely measuring the ventilate that is getting gone the MAF, as a result if the intake manifold is sucking in expose the ventilate to fuel ratio will be no question out and cause the engine to stal