1996 Chevrolet K1500 5.7L Misfire in Cylinder 6 - Diagnosis & Solutions
Hi, I own a 1996 Chevrolet K1500 with a 5.7L V8 engine. The vehicle is running poorly—when idling, it experiences rough revving that fluctuates up and down before stabilizing slightly. However, when in gear, the engine exhibits severe lurching or surging. I've confirmed that all cylinders have equal compression and strong spark. Despite this, there's a noticeable misfire in cylinder 6. I'm at a loss as to what could be causing this issue and would appreciate any guidance on troubleshooting steps.
First, check for any stored diagnostic trouble codes (DTCs) using an OBD-II scanner—post the results. Perform a fuel pressure test and monitor the leak-down rate to assess fuel delivery consistency. Since you suspect cylinder #6 misfire, please describe the condition of the spark plug: wet, dry, black, or white? Always use AC Delco original plugs when replacing them. Also, let me know if the vehicle has any modifications or aftermarket parts installed that might affect engine performance.