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For a 2008-2012 Honda Accord with a K24Z2 or K24Z3 engine, a worn rear engine mount can produce clunking, vibration, and excessive engine movement under load. Common OEM or service part numbers referenced for the rear mounting area include 50820-TA0-A01 and 50830-TA0-A01; exact application depends on transmission, chassis, and VIN, so confirm the specific bracket and mount before ordering. When replacing the rear mount, safely support the engine with a jack and wooden block, remove the mount fasteners, replace the mount, and tighten all bolts to the factory torque specifications from the Honda service manual. Many K24 Accord mounting layouts use roughly 43 N·m (32 lb-ft) for mount-to-frame fasteners and 54 N·m (40 lb-ft) for bracket-to-engine bolts, but the exact values should always be verified for your model year and engine. A damaged engine mount can also cause symptoms that resemble drivability problems. DTC P0300 is the generic SAE J2012 OBD-II code for random or multiple cylinder misfire; while a broken mount can stress the engine wiring harness or cause a false misfire reading, diagnosing P0300 should include checking ignition components, fuel delivery, vacuum leaks, and compression. Use a scan tool to read freeze-frame data and verify whether the mount condition caused the misfire or whether the misfire is unrelated. For all structural and torque-critical work, refer to the official Honda service information for the exact vehicle and engine combination.