Attempted to do the coil packs and was able to remove all of the coil packs except #4. There is a torx screw at the back side of the #4 coil pack. Could not see the size and I was working in the evening so low light. Does anyone know what size that torx is or any instructions on the best way to remove? It feels to be stripped so is there a good extractor for that area as it is really tight.