Car is full on all fluids idles fine but just started over heating

What is your question?

Full on all fluids car just started over heating sitting in parking lot after a 15 min drive. Days before I had a miss fire cylinder 4 so I bought all new spark plugs and coils, went to put them in but the light went away. But my main point is why is my car overheating when it sound, idles just fine no ticking clacking nothing.