after fitting new spark plugs, dizzy cap and HT leads my car was running fine but went out in it the other day it was only ruinning on three cylinders, after checking the plugs, i found that it was the fourth cylinder that wasent working, so i changed that plug for another new one and it went on three again uintl half way up the street when it burst in to life, but now no matter wot plugs are in it it only seems to be running on three.

if u can make sense of that then any help would be appreciated)

cheers chris