Hi My car started to shutter pretty badly so i put on my reader but no codes where there. So i decided to take out the plugs and as you can see from the picks 1 is not looking so good. They have only done about 3500 miles since they where last changed. The one on the right is from cylinder 4.I changed them out for a new set to day but problem is still there. Can any one suggest what i should try next? Car is not driveable the way it is.