This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and as a result not compensated for and can lean the engine out and can as a consequence allow the engine to rev happening when not desired causing sharp running. As its a mechanical defect it tends not to slant upon the irregularity fresh and you can sometimes hear a hissing noise subsequent to the engine running.
Its along with worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a ill pump will all upshot in insufficient fuel physical delivered to the engine. Might plus be worth cleaning out the idle keenness control motor / valve as these get clogged stirring in the manner of carbon and some brake cleaner washed through helps clear things off.
I don't have any check engine lights unless I unplug the MAF sensor. taking into account the MAF is plugged in after that the car will stall unless I put my foot upon the accelerator. There is after that an intermittent popping hermetically sealed coming at idle.