Can't Get Rid Of P0303 Error

Engine Repair OBD II Code P0303 - p0303 38K miles and changing oil at 5K intervals , my check engine light came on and the OBD reported a P0303 that wouldn't clear p0303 Read code got, Cylinder 3 misfire code P0303 Im gessing its either spark plug, coil pack or leads Has anyone had this problem? What is the main issue with

p0303 A P0303 code indicates that the car's computer has identified a problem with one of the engine's cylinders not firing correctly In this case, it is