Ok so the car was running pretty good for a while then started having a misfire, so I removed the plugs and checked them to see plug 1 ruined. I replaced it the misfire was good for a bit then it's back again. Checked the plug and it was pure black with carbon. Goes black after a day and I only drive like 10 minutes to work. Just trying to work out what might cause this, could it be a vacuum hooked up wrong ? Bad leads ? Bad dizzy ? I'm lost. So I've come to the gurus, I have attached a photo of the plug that was ruined. Also a photo of the only vacuum I've got hooked up.