Finally got some new plug wires(Jacobs custom fit, found them locally for $29) and noticed a big difference in the cooler weather. My truck always felt like it was down about 5-10 hp in cooler weather and it may have been the plug wires all along. But now that I have new plugs, new wires, new cap, new rotor, it feels like a new truck. Lots more pep even first thing on a cool morning, no pinging as it gets near 3000 rpm's, no problem towing the boat. The amazing thing is that the old plugs are actually pretty darn clean considering the huge gap, wrong heat range, old wires and distributor cap with rusty terminals. I can probably bump the timing up a little now too.