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 thin the engine out and can as a consequence permit the engine to rev happening in the manner of not desired causing scratchy running. As its a mechanical malfunction it tends not to tilt upon the aberration lively and you can sometimes listen a hissing noise in imitation of 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 do a quick fault locate if you unplug the meter and direct the engine without it. if the engine condition is the similar then chances are the meter or the connection to it is faulty. Its as a consequence worth cleaning the MAF sensor wires, as they can acquire coated afterward dirt more than grow old which then offsets the reading. Use some gain access to cleaner or brake cleaner to vaporizer onto the wires to separate the dirt on no account be adjacent to the wires with anything as they are definitely fragile
Hello the TPS does have an effect on switching the car into idle mode correspondingly I'd recommend to make determined the throttle dish is 100% closed and not slightly ashore in the manner of carbon. and after that adapt the TPS appropriately that the IDL attach is continuous to the E2 glue gone the throttle is closed, and way in circuit taking into account the throttle is just cracked. Don't distress approximately any voltages, the IDL admission is the in reality important one.