This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and fittingly not compensated for and can thin the engine out and can furthermore permit the engine to rev going on later not desired causing harsh running. As its a mechanical oddity it tends not to approach on the malformation open and you can sometimes hear a hissing noise next the engine running.
Might afterward be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can reach a quick fault find if you unplug the meter and rule the engine without it. if the engine condition is the similar later chances are the meter or the association to it is faulty. Its with worth cleaning the MAF sensor wires, as they can acquire coated taking into account dirt beyond get older which subsequently offsets the reading. Use some admission cleaner or brake cleaner to vaporizer onto the wires to separate the dirt on no account lie alongside the wires subsequent to everything as they are very fragile
I'm reviewing your ask now, and will proclaim incite taking into consideration your answer ASAP. Rgds Greg. What irregularity codes realize you have. Does the engine manage as soon as the MAF disconnected. like the loud hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is solitary measuring the air that is getting gone the MAF, appropriately if the intake manifold is sucking in ventilate the expose to fuel ratio will be no question out and cause the engine to stal