I have a 2005 Soft Tail Fatboy 96 in. I installed a Thundermax Autotune and a heavy breather air filter. I watched the official installation video numerous times and followed the written instructions to a "T". At first start-up the idle was extremely erratic. The first ride (approx. 10 miles)...my bike stalled 9 times...idle was not right...speedometer went nuts...stuck at 120 mph then back to zero when I was riding at least 45 mph...very weird.
Does anyone have any idea what is going on?

 

I used this video http://www.youtube.com/watch?v=5nr3akoWt6w
did you cycle the ignition switch like it said?

Before you rode it did you run the IAC auto?

 

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initialize the ecm after loading the as close to the right map you can find I have 3 even started one up with a different bike map and it still never had much of an issue except running rich ....