My 03' Annv. Fatboy fuel injected, dies after I crank it up and go about two miles down the road. It mainly happens when its cold. But it still does it from time to time even after it warms up. It will just die for a couple of seconds then catch back up. Also it has hung up about 3000 rpm a couple of times. Anyone know what this could be ?

 

Check the TPS. I bet it has gone bad. If you have a tuner, hook it up and monitor what is says your throttle position is at. If it doesn't go from 0 to 98% or so then the sensor is bad. You can try to wiggle the wires coming from it to see if it is a bad connection and if you have a multimeter you can make sure the resistance smoothly goes up and down, but quite honestly I would just buy a new one and replace it. A $30-$35 part that really has to be replaced every 3 to 5 years to get accurate data to the ECU.

 

I have 115,000 miles on my TPS and it's flawless. I've never heard of replacing a TPS every 3-5 years. Doesn't mean it's not possible for it to be defective, but I would never tell someone to replace it regularly.

You can look at the speed sensor if you have a tuner, or simply back probe it with a voltmeter.

Your symptom could also easily be a sticking IAC motor. The IAC is responsible for moving in and out and allowing different amounts of air into the intake to control idle.

The speed sensor is also used for the idle strategy on that bike. Is your speedometer acting correctly and the turn signals canceling? When the bike is in neutral and rolling, the IAC will open slightly and raise the idle just slightly. Then as the speed sensor reports zero speed, the idle will settle down.

 

Similar problem with my injected 02 Fatboy at about 20,000 miles. Turned out to be the fuel line inside the tank had cracked and caused pressure problems. While in there you might as well replace the fuel filter. JMO

 

None of those other issues would explain both a high idle RPM and the bike dying. I would put money on the TPS. Your throttle position is bottoming out at like 25% so the ECU is putting too much gas into the chamber and flooding it. When it first goes bad the bike is usually running so the idle will go way high but after you turn it off the ECU resets and it will try to idle again with the new base level but it is still putting too much fuel in to the chamber for the position of the air intake. A low pressure problem in the fuel line would not cause a high idle, the IAC wouldn't cause it to die while traveling, I guess the speed sensor could cause problems but I'm not sure how that would cause the bike to die while traveling either.
I should correct myself, a TPS is only as accurate as to fall in to manufacturing tolerances for 3 to 5 years. It does not need to be replaced that often.

 

Oh course, I could be wrong and you have two separate issues, but the TPS explains both problems you are having and are known to have to be replaced.

 

I read it as dies at idle. Oh well.