but if my firing order was not right, it would be a constant problem, correct?

this isnt a constant, sometimes it runs smooth, sometimes, it runs like a tractor... I can be driving along, no change in throttle & it will start its nonsense, then maybe go back to running smooth... or more than likely the other way round. running kak, then run smooth for a while then back to kak - all the while I will be keeping a constant pressure on the throttle... speed changes when the running of the engine changes.