2008 street glide upgraded to 103 big bore bogs down when starting out from stop. air fuel maybe? sometimes a little hesataion
If the engine is carbureted, your accelerator pump may not be working correctly. Take you air filter off and look inside the carb. With the engine OFF, crank the throttle to wide open position. You should see a stream of fuel spray into the carb. If not, the diaphragm in the accelerator pump may be bad. If you think you have a fuel air mixture problem, find a shop with a dynometer and an exhaust gas analyzer to run it up and check the jetting for you. If you've spent the money for a 103 upgrade, spend a little more to get it right and get the benefit of the big engine.
Good Luck
Steve
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