If you recently put new plug wires on,
Here's a TSB that discusses wire routing and at least some of your symptoms:
Pay particular attention to the warning about plug/coil wire(s) crossing only at right angles and notice how close the coil wire is to the #8 wire where the two wires come away from the dizzy cap! Notice how the coil wire is routed straight down the side of the distributor with the #8 wire crossing it at a right angle. Same deal where #8 connects to the plug and crosses the #6 plug wire.
According to the TSB:
"This rerouting procedure should be performed before any other misfire, surge, or spark knock repairs are attempted.