One day it runs fine the next its firing on 3

Ive had problems ever since i did the install, last week i thought i had it spot-on and i came to start it this week and its running lumpy, theres no diference when i remove no 1 and 3 HT leads and removing the oil cap doesnt cause the revs to rise, any0one any idea where to start as ive run out of ideas to try