so if cylinder 5 is misfiring, I would want to work on the second one in, when looking at the car from the front. I think it is a problem with the ignition coil boot most likely, as I have replaced the spark plug and the ignition coil - just did that last week. I think I will buy one boot for now to replace it (one of the boots was in bad shape, but since I didn't have a replacement, I let it go...)