Help! I have a 2005 883 Custom Sportster rebuilt to a 1200. I am the original owner. My bike is well-maintained, garage-kept. Last year my bike started this issue and I haven't found anyone who can figure it out. It starts fine but spits out through the carb. Once it warms up while we're on a ride, I lose acceleration. There is no response from the throttle but the bike does not cut out. We were able to coast home after only riding 1/2 mile with the bike running but not accelerating. We were passed by an elderly gentleman on a ten-speed! I have done the following: rebuilt the carb; replaced plugs, fuel, and vacuum lines; replaced the air filter; cleaned the petcock. Is there anything else I should check? Throttle, computer, electronics?