Assuming that; these are twin tower (twin fire) coils as per Zed type, and there is in excess of 12 V at those revs; as has been said recently the coil is the same for 1 and 4 cylinders and generally if you have a problem with one you really have a problem with both. (its the same piece of wire running round in a loop!) The thing about the wasted spark is that it is not even. In the sense that the coil fires both cylinders at once and one is not needed. The great part about this is the coils' power is directed to the point of highest resistance and in each firing cycle it will be the cylinder in the pair which is at firing point on compression stroke. It just 'bleeds' through the other plug and lead alternately. If you have a plug that wont fire it suggests that it is the other plug / lead / cap combo in the pairing that has the higher resistance. You have to increase the resistance of the one that wont fire to get it to do anything. I would look at the lead, cap and plug of cylinder #one with a suspicious eye and see if any of the connections there are corroded, lead has unusually high resistance or the plug cap is significantly higher than 5 K Ohms. With one meter lead shoved up the HT output from the coil and the other on the centre electrode of the plug you should get identical readings for Ohms resistance for both pairs on a given coil.
AL
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