This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and for that reason not compensated for and can lean the engine out and can as a consequence permit the engine to rev stirring in imitation of not desired causing rough running. As its a mechanical deviation it tends not to perspective upon the irregularity lively and you can sometimes listen a hissing noise as soon as the engine running.
Might furthermore be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can realize a fast irregularity locate if you unplug the meter and govern the engine without it. if the engine condition is the similar after that chances are the meter or the relationship to it is faulty. Its after that worth cleaning the MAF sensor wires, as they can get coated like dirt beyond era which subsequently offsets the reading. Use some gain access to cleaner or brake cleaner to vaporizer onto the wires to surgically remove the dirt upon no account touch the wires considering all as they are entirely fragile
This could be a large vacuum leak ,with the MAF amalgamated it is solitary measuring the freshen that is getting in imitation of the MAF, fittingly if the intake manifold is sucking in let breathe the air to fuel ratio will be enormously out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. behind carb cleaner spray spray in the area of the hissing later the engine supervision and once you listen the engine stall or rev forward-looking there is the leak ,could be a bad vacuum hose bad gasket on the manifold.