This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and as a result not compensated for and can thin the engine out and can afterward permit the engine to rev up past not desired causing harsh running. As its a mechanical fault it tends not to twist upon the oddity spacious and you can sometimes listen a hissing noise in the same way as the engine running.
Its afterward worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a in poor health pump will every repercussion in insufficient fuel visceral delivered to the engine. Might in addition to be worth cleaning out the idle eagerness manage motor / valve as these acquire clogged occurring behind carbon and some brake cleaner washed through helps clear things off.
Hello the TPS does have an effect on switching the car into idle mode hence I'd suggest to make positive the throttle dish is 100% closed and not slightly stranded afterward carbon. and next adjust the TPS as a result that the IDL pin is continuous to the E2 fix later the throttle is closed, and log on circuit in imitation of the throttle is just cracked. Don't cause problems virtually any voltages, the IDL gate is the in reality important one.