This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and hence not compensated for and can thin the engine out and can as a consequence allow the engine to rev up as soon as not desired causing scratchy running. As its a mechanical malfunction it tends not to incline upon the malformation roomy and you can sometimes listen a hissing noise taking into consideration 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 realize a quick deformity locate if you unplug the meter and direct the engine without it. if the engine condition is the same next chances are the meter or the association to it is faulty. Its moreover worth cleaning the MAF sensor wires, as they can acquire coated like dirt greater than time which after that offsets the reading. Use some log on cleaner or brake cleaner to vaporizer onto the wires to cut off the dirt upon no account touch the wires in imitation of whatever as they are extremely fragile
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