Posted this previous. Have an 06 Ulysses, Race ECM, NGk plugs, new plug wires, breather mod, airbox mod, K/N filter, Jardine RT-One, reset TPS with ECMSPY. Cleaned all grounds, no codes stored. Bike idles badly, stumbles and misses when cold and when it rains. Any ideas, thinking maybe intake gaskets. Have read that maybe IAT sensor. HELP
Check/clean your plugs, set idle to just under 1000 Rpm after getting motor to operating temp, keep idle time to several minutes & take it easy the first several miles when you start to ride until the engine is fully warmed up. Those things will help to a degree, to fully get to where you want to go, you need some custom tuning done to your ECM.
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