I'd recommend some new plug wires along with dilectric grease on both the spark plug ends and the coil ends.
Spray some electronic cleaner in all the coil connectors and let it dry before connecting the plug wires.
Time for some Magnecors ?

Hint : the very easiest way to change coil wires is to remove the valve covers. Seems stupid, yes, but you will be amazed how easy it is to get to the plugs and wires with them removed. You can unplug all the coil end wires and leave the coils on the valve covers.