As a very general rule of thumb, cutting out eg at traffic lights is fuel related, mis-firing is ignition component related. From your description I would suggest condenser.
Barrys advice is definitely the way to go:
My advice would be to replace one item at atime with a run out to test it. That way you should be able to identify the culprit. If you change everything in one go you'll be none the wiser.
And its good to know what went wrong as quite often unless its just wear and tear (old age) the same thing can go wrong again if there is an underlieing problem behind it.
Cheers
Jules
RatSport www.ratsport.co.uk