The GM 15865791 Mass Air Flow (MAF) Sensor, also known as ACDelco 213-4222, is designed to provide accurate air intake measurements for LS3 and LS7-powered vehicles. This MAF sensor plays a crucial role in ensuring your engine receives the correct air-to-fuel ratio, improving performance, fuel efficiency, and throttle response. A faulty MAF sensor can cause engine hesitation, rough idling, stalling, poor fuel economy, and check engine lights. This direct replacement unit is manufactured to OEM specifications and offers plug-and-play installation, making it an essential component for restoring or upgrading your LS engine. Whether you're replacing a worn-out sensor, performing an LS swap, or fine-tuning a performance build, this MAF sensor provides the accuracy and reliability needed for peak engine operation.