You might also want to do a compression test on your #1 and another cylinder to compare the two. If the compression on #1 is low, put about a tablespoon of oil into the plug hole and run another test. If the pressure improves, then the oil is temporarily sealing the rings. Fresh plugs require less spark to fire, so if the compression on #1 is close to the same as the others, then you may have a flaky plug wire on #1.
