I have a stock 2005 Road King Classic (FI) with less than 10k miles that has a strange sound when I roll on the throttle hard. My best description for this is a gurgling rattle. It is worse when the engine is hot or it is really hot out 90F It is worse under load (uphill or two up) It stops as soon as I let off the throttle There's no backfiring. Am I running too lean? I'm considering getting a 3rd party DFO/TFI to richen it up a bit (plan on getting louder pipes soon too). Could the add-in help my problem? Anyone else have this issue? Thanks, Gary F.