[xlr8or]

If it's the same cylinder/s mis firing as you indicated by temp differences there are only so many things are are unique to them. Plugs, wires, teriminals on cap, tabs on distibutor shaft that the pickup sees. Swap the plugs and wires from those cylinders to another pair and see if the problem follows them. If the problem remains on the same cylinders a closer inspection of the cap and distibutor internals is required. If the problem follows them you have your answer.