the higher idle will use more fuel and make the car run hotter when sitting at a light.not huge issues, but lowering the idle is still a good idea.start by checking your motor mounts, if they are bad they can cause vibration at idle.
Shame on you Tyler...
I don't even know what to say...Another potential cause of a rough idle could be uneven compression. You should check compression with the engine cold and with the engine at temperature.