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What did the plugs look like when you replaced them, any different than others.

The GL1500 has a plethora of vacuum lines all which could be leaking or cracked and leaking, you could try to remove the lower plastic and use the old carb cleaner spray method to try and locate vacuum leaks.

Another guess may be the vacuum petcock diaphragm. If it holes through you'll probably first notice a gasoline smell, followed by a loss of power when the spark plug fouls in the middle position right bank. (Vacuum line goes to that intake runner)

Mine was in the shop 5 times for "carb cleaning" and synching. It took me half a day of troubleshooting to find the petcock problem and the only way I verifyed it was to remove the petcock and dis assemble it on the bench. ~130.00 $ (US) part.
 
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