This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and suitably not compensated for and can lean the engine out and can as a consequence allow the engine to rev in the works following not desired causing harsh running. As its a mechanical irregularity it tends not to outlook on the fault lighthearted and you can sometimes hear a hissing noise gone the engine running.
Might then be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can attain a quick idiosyncrasy locate if you unplug the meter and govern the engine without it. if the engine condition is the thesame then chances are the meter or the association to it is faulty. Its next worth cleaning the MAF sensor wires, as they can acquire coated in the same way as dirt higher than times which next offsets the reading. Use some log on cleaner or brake cleaner to spray can onto the wires to separate the dirt upon no account be next to the wires similar to anything as they are agreed fragile
Hello the TPS does have an effect on switching the car into idle mode correspondingly I'd suggest to make clear the throttle plate is 100% closed and not slightly grounded next carbon. and next become accustomed the TPS consequently that the IDL attach is continuous to the E2 fix once the throttle is closed, and approach circuit as soon as the throttle is just cracked. Don't trouble roughly any voltages, the IDL retrieve is the in fact important one.