I did some searching for you and found this tidbit

I'd start with this first as it should be something you could do yourself or the local yokels should be able to change out plugs.

Quote Originally Posted by AlaskaVX
At around 64,000 miles mine got a code that said "random misfire" I just did what I can do and changed the spark plugs first. Sure enough I haven't had a problem since. Just something cheap that might work. I had problems with the back right one but it was easily done myself with lots of little extensions. You have to fit them together inside hole to spark plug and then take them apart by using a screw driver down in there to pry extensions apart.

I am supercharged and that is the reason the back right one was difficult.