This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and for that reason not compensated for and can thin the engine out and can as well as allow the engine to rev going on when not desired causing rough running. As its a mechanical oddity it tends not to slant upon the idiosyncrasy buoyant and you can sometimes listen a hissing noise like 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 accomplish a fast anomaly find if you unplug the meter and manage the engine without it. if the engine condition is the similar then chances are the meter or the association to it is faulty. Its plus worth cleaning the MAF sensor wires, as they can get coated subsequently dirt more than get older which subsequently offsets the reading. Use some contact cleaner or brake cleaner to vaporizer onto the wires to sever the dirt on no account be adjacent to the wires in the manner of whatever as they are totally fragile
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