Nyanzor

Had some trouble with the engine misfiring off of one cylinder, so I removed the ignition wire from that cylinderhead. The car would run nicely with no misfire, but only on 3 cylinders ofcourse. I ordered everything new, Coil, ignition cables, rotor, dizz cap, contact breaker, and condenser. Also 4 new spark plugs. Could it be a timing issue? The timing belt was replaced 4 years ago, not sure about mileage but it's not much. Will update as i install my new items. It is the 1 litre petrol engine.