Last month I purchased my first car from my local craigslist. The car is high mileage, but I plan on taking great care of it and properly maintaining it. The previous owner was very forthcoming with some issues that the car had and I figured that for the price I could fix all of it and have a great car in the process, but I have found myself having problems troubleshooting the problems. I took the car to my local autozone and had them run a code scanner on it. Cylinder 5 was misfiring. So I bought 6 brand new sparkplugs and a new coil for cylinder 5. Now when I rune the code scanner on it, it says random misfires. Any tips on how I could diagnose this problem?