On my last run at Curborough Ruby started misfiring. I decided to head for home after checking all the leads were on. It was a difficult journey she would run ok if I kept a steady throttle but would miss like crazy if I tried to accelerate. OBD reader said misfire cyl 1. Tonight I took out the plug, the well was full of water despite the car being run all day the heat had not dried it out. The plug was covered in brown sludge. Dried it out with tissue shoved down the well and fitted new plug, good as gold. Most find a cover for the top of the engine.