Check the top of the throttle body there is a rubber cap on a vacuum stem, if the cap is gone or cracked it may cause a idle issue. A lot of idle problem can be the result of a vacuum leak so check the throttle body and make sure it is tight.
Also cycling the ignition on then off 5 times will reset the engine's idle speed.
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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.