Wires may be a good next step. Before you do that, check them at night to see if they have any spots where they can be arcing. Check the nipples where they plug onto the dist cap for corrosion. If it sits for short spells, check to make sure that no intruders got up/under the hood and decided it was a nice place to take a lunch break.
I'd also add some fuel injector cleaner. #2 should be the front wire on the driver's side. Trace it well and look for white powdery spots.