I had the same problem a couple of days ago minus the oil on the plugs. Switched coil and it's been fine. What you have to do after switching the coil is crank it at wot until it starts. I kept on cranking my motor for about 30 seconds (poor starter). Reason for the long cranking is because the cylinders needs to build compression. I kind of get it but if someone could explain it then it'd be great.