This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and fittingly not compensated for and can lean the engine out and can as a consequence permit the engine to rev taking place subsequent to not desired causing uncompromising running. As its a mechanical deviation it tends not to slant on the aberration vivacious and you can sometimes hear a hissing noise taking into consideration the engine running.
Its as a consequence worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not at your best pump will all upshot in insufficient fuel creature delivered to the engine. Might next be worth cleaning out the idle speed direct motor / valve as these get clogged up considering carbon and some brake cleaner washed through helps release things off.
I don't have any check engine lights unless I unplug the MAF sensor. as soon as the MAF is plugged in later the car will stall unless I put my foot on the accelerator. There is with an intermittent popping solid coming at idle.