have a 03 hyundai santa fe that has had 2 different misfires codes in the past month. 1st was cylinder 1, replaced coil and sprayed with WD40 and problem went away. 2 weeks later starts skipping again, this time with cylinder 3 misfire code--rather that replace another coil, I took out and cleaned spark plugs (new), wires, coils, and coated in dialectic grease. This fixed it and it ran great for about a week in a half. Now misfire 3 again. Going to change wires next. if that does not fix it, where should I look next? and does the fact that it went away with cleaning and grease coating suggest it is something with moisture rather than a more involved problem?