I have a 2000 ultra classic with efi, I bought the bike this past Sept. This problem existed when I bought it but the price was so good! #1 It starts hard, it cranks way to many times for being injected. #2 When it does start there is a constant small backfire going on in the intake manifold. I have run it with the air cleaner off and can see small explosions in the manifold. #3 It runs like this going down the road also, the only time it seems to run close to correct is when it is under a heavy load, ie: pulling up a hill or rolling on the throttle. #4 There are no codes the engine light is not on. #5 I have pulled the intake apart to change the intake gasket thinking maybe it had a leak. I noticed that the rear cylinder intake track is carboned up some, the front one is clean. #6 I don't know the history of the bike, it has 35k miles on it. I beleive I am the third owner. Someone has changed the exaust to a two in one. I dont know if any mapping changes were made. I just found this sight the other day, Super good! I appreciate the tight control on language and content. Please help, I know someone can, Thank you, mttdad.