This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and for that reason not compensated for and can thin the engine out and can then permit the engine to rev occurring taking into consideration not desired causing sharp running. As its a mechanical oddity it tends not to aim on the oddity well-ventilated and you can sometimes hear a hissing noise in the manner of 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 sick pump will every upshot in insufficient fuel subconscious delivered to the engine. Might as a consequence be worth cleaning out the idle promptness control motor / valve as these acquire clogged taking place past carbon and some brake cleaner washed through helps free things off.
I don't have any check engine lights unless I unplug the MAF sensor. in the same way as the MAF is plugged in later the car will stall unless I put my foot on the accelerator. There is moreover an intermittent popping sound coming at idle.