Thanks for any and all help, I'm getting frustrated. I'm having issues with my 97 Fatboy Evo, when cruising at 1/8-1/4 throttle in any gear and roll-on the throttle, it hesitates/stumbles, and then goes. It feels as if it is running at 10,000ft, stumbling because of not enough air/too rich. Plugs look good, it has been dyno'd and charts good. It has the Dynojet kit in with 170 main, dynojet needle, 42 pilot. I tried using the stock needle but was very lean. It also has an EV27 cam, V&H Bigshots, and the Ness Big sucker. Can't find any carb leaks. The accelerator pump is good. I think it is running too rich when it rolls on. I ride at 4500ft on up usually. What needle is everyone using? And slow jet? Would it help to add a better ignition module? Thanks!