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The engine idles around 625-750 rpm when warm. I have yet to check for intake leaks. Are you suggesting that I open the valve on a propane torch and without lighting it, pass it around the motor so that if there is a leak, propane will be drawn in and I will be able to hear changes in the way...

I have a 2002 LS V8 with 190,000 miles that is idling rough. I replaced the valve cover gaskets around 100,000 miles and since then have not had any issues with failing COPs. Additionally, I changed out all 8 coils and spark plugs around 150,000 miles. Prior to replacing the valve cover...