Took my spark plugs out today to inspect them as i wasnt convinced i wasnt running on all four cylinders. Two spark plugs are fireing im shure but two doesnt seem to have ever fired as they where still like new and where covered in fuel. What could cause this? Takeing into consideration i have a newly built engine running efi, new plugs, leads, and has only been fired up twice. im shure im getting fuel but no spark? Please help me!!!!!!!!