Where is the crankshaft sensor located on a 1998 chevrolet silverado 5.7 L

The Crankshaft Position Sensor (CKP) is located at the lower front of the engine on the engine front cover, also called the timing cover. Through a use of magnetic pulsation, the CKP sensor provides the PCM (control module) with a crankshaft position signal. The PCM uses that signal to determine the spark sequence (firing order) for each cylinder. It also uses the signal to precisely control ignition timing and calculate engine speed, etc. Easy fix and clean the area out first with brake cleaner before working around that area and take care not to break the tab on the wire harness that connects to the crank sensor. Good luck