Yep, had that problem once, tried changing coils etc, then seen the adjustment, DOH 

Old the old coil via the DMM I was getting 2.6ohm readings which aparently is too low so being its the shooter it deserves a holiday...

The new one reads about 3.1, 3.2 but these are aparently the biggest williams coils so not sure if the readings should be the same or not?