You can check the plug wires with a multimeter, if the wires have around 5.5+/- ohms of resistance they are good. There is also the coil plug under the fuel tank make sure it has a good connection and use some dielectric grease on it.
You could have a dirty injector did you try running a little injector cleaner in the fuel??
I wouldn't think it would be the O2 sensors but you can pull them out and clean them with some carb cleaner just to make sure.
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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.