R1ckyg

Hi all,
I think I need a coil pack but please see if you think I am on the right track...
I put new plugs in the 3i thinking it had been standing for a while and just needed a service only to find it is still lazy and lumpy...
I put a strobe time onto lead 4 and it flashes great then you can see it misses a beat and then you hear the exhaust quietly 'pop'.
This also happened on lead 1 but 2&3 seem to be quite stable....
I am struggling to find a coil pack but then again wont buy one if it isn't necessary but I cant think what else it could be...
Your thoughts are greatly appreciated...
Also, if you think I am right... anyone got one for sale!!