I have a 08 Xterra 2WD Auto with almost 99K. I take good care of her and plan to replace the spark plugs in a couple of weeks. I wanted to know should I change the coils at the same time since they have to come off anyway and the passenger side is a bear. I have no trouble lights and overall the truck runs great, however I have started to notice a bit of a rough idle after everything warms up, I give it a little gas and it appears to go away but returns once the revs come back down. Any advice would be greatly appreciated.