If you want,you can tip down to me,ive a spare engine and i can swap the dizzy over to see if it fixes it,if not i'll have a better look at it
How long have you owned it??
fcd might have been set up with shit plug's and now you got new plug's it might not be right...
y would the plugs have anything to do with the fcd lol?
Because if the plug's were on there way out it would not of been sparking to there full potentional, now with new plug's he will have a better spark ignighting the fuel better...