This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and correspondingly not compensated for and can thin the engine out and can as a consequence permit the engine to rev occurring later not desired causing coarse running. As its a mechanical irregularity it tends not to direction upon the defect well-ventilated and you can sometimes listen a hissing noise with 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 realize a fast anomaly find if you unplug the meter and run the engine without it. if the engine condition is the similar then chances are the meter or the association to it is faulty. Its as well as worth cleaning the MAF sensor wires, as they can acquire coated taking into consideration dirt higher than time which then offsets the reading. Use some right to use cleaner or brake cleaner to vaporizer onto the wires to surgically remove the dirt on no account touch the wires bearing in mind whatever as they are totally fragile
This could be a large vacuum leak ,with the MAF joined it is single-handedly measuring the air that is getting past the MAF, so if the intake manifold is sucking in let breathe the ventilate to fuel ratio will be no question out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. as soon as carb cleaner vaporizer spray in the area of the hissing past the engine dispensation and in the manner of you listen the engine stall or rev highly developed there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.