Re HT leads.
I have just fitted new ones to the car, but it is now misfiring worse than before? It was just a little blip when put foot down in 5th but now its much more lumpy? (brand is prospark, by the way)
I have checked at night in dark and I can see arcing going through the leads in the new ones too - I thought this was an indication of old ones going bad? I thought that new ones would have no arcing visible at all.