This could be an airleak after the airflow meter, any expose dragged in here isn t seen by the ECU and correspondingly not compensated for and can thin the engine out and can then permit the engine to rev occurring considering not desired causing sharp running. As its a mechanical aberration it tends not to point on the anomaly light and you can sometimes listen a hissing noise following the engine running.
Its then 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 repercussion in insufficient fuel brute delivered to the engine. Might moreover be worth cleaning out the idle enthusiasm run motor / valve as these get clogged taking place taking into consideration 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. behind the MAF is plugged in next the car will stall unless I put my foot on the accelerator. There is after that an intermittent popping solid coming at idle.