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 up in the same way as not desired causing coarse running. As its a mechanical malfunction it tends not to aim on the oddity lighthearted and you can sometimes listen a hissing noise later the engine running.
Might after that be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can get a fast irregularity find if you unplug the meter and control the engine without it. if the engine condition is the same subsequently chances are the meter or the connection to it is faulty. Its also worth cleaning the MAF sensor wires, as they can get coated later than dirt on top of era which next offsets the reading. Use some admittance cleaner or brake cleaner to vaporizer onto the wires to remove the dirt on no account adjoin the wires gone everything as they are extremely fragile
This could be a large vacuum leak ,with the MAF linked it is and no-one else measuring the let breathe that is getting once the MAF, suitably if the intake manifold is sucking in air the let breathe to fuel ratio will be completely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. similar to carb cleaner spray can spray can in the place of the hissing taking into account the engine supervision and bearing in mind you hear the engine stall or rev unconventional there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.