The problem may not be in the handlebar area. Try putting some dielectric grease on the TCA plug. The TCA ( Throttle Control Actuator) is located to the rear of the air cleaner, disconnect the plug and put the dielectric grease on the plug where the pins will go in, clear the codes and ride the bike to see if the codes return.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.