I know you said you've changed the plugs and plug wires, but I'd suggest checking both again. Check the plugs for the correct gap and cracked insulators. I've also heard more than once of people getting a bad set of wires, also check to make sure you got all the plug wires snapped into place good at the distributor and on the plug. Try starting the car in a dark area with the hood up to see if you see any fire arching from the plug wires. Have you tried putting a fuel drier in the tank to remove any moisture that may have got in the system?
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