This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and therefore not compensated for and can thin the engine out and can afterward permit the engine to rev happening when not desired causing brusque running. As its a mechanical oddity it tends not to incline upon the defect lively and you can sometimes hear a hissing noise subsequent to the engine running.
Might in addition to be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can attain a fast aberration locate if you unplug the meter and control the engine without it. if the engine condition is the same next chances are the meter or the attachment to it is faulty. Its also worth cleaning the MAF sensor wires, as they can get coated when dirt on top of period which later offsets the reading. Use some contact cleaner or brake cleaner to spray onto the wires to separate the dirt upon no account be next to the wires later anything as they are enormously fragile
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