OK - took leads and dizzy cap off, put sum diff plug leads on, started running on 2 cylinders, so put the old leads back on still on 2 cylinders, 1 & 4 are dead but if you put a plug in the leads they are all sparking.......just took plugs out to clean em and number 1 was covered in oil......any ideas???

Also wen I put the ignition on (dont even have to start it) it backfires well loud!!!!!