It doesn't hurt to do a basic tune up plugs and a fuel filter would be the best thing to do no matter what. You can check the plug wires with a multimeter if the plug wires are good you should have 5.3 to 5.8 ohms of resistance.
You may have a small vacum leak, there is a rubber plug on the top of the throttle body that may be cracking or the rubber throttle body gaskets may be cracking.
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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.