Am I to assume your saying that no.s 2 & $ are fireing if so it would appear that the the coil that fires 1&2has given up the ghost the easiest way to check this is to simply swap the coils around that is 2&4 to fire 1&3 etc if it starts to run on 1&3 theres your solution of to the dealers purchase a new set of coils yes I said a set because you can bet if ones failed the other wont be far behind before it to fails