This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and in view of that not compensated for and can lean the engine out and can as a consequence permit the engine to rev happening taking into account not desired causing harsh running. As its a mechanical defect it tends not to tilt on the anomaly roomy and you can sometimes listen a hissing noise later than the engine running.
Its furthermore worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not a hundred percent pump will every result in insufficient fuel innate delivered to the engine. Might also be worth cleaning out the idle quickness manage motor / valve as these get clogged taking place following carbon and some brake cleaner washed through helps pardon things off.
I don't have any check engine lights unless I unplug the MAF sensor. afterward the MAF is plugged in subsequently the car will stall unless I put my foot upon the accelerator. There is moreover an intermittent popping hermetic coming at idle.