Yikes, I am glad I saw this thread. Other than to the plugs themselves, can any damamge result to the engine for improperly gapped plugs? I changed my plugs about a year ago and was unaware of any TSBs. This was the second time I changed my plugs. The first time I chagned my plugs was before the TSB mentined above and my gap was still .06. This last time, I gapped them at .06 like I did the first time but it sounds like they should be at .04. Am I ruining my engine or just the plugs?