Motorcycle Repair: missing, air fuel ratio, irregular intervals

Question
2001 Road King Classic
Fuel injection
45000 miles
new plugs
new fuel filter
On the trip from NC last week my bike began to miss at irregular intervals. I tried HD fuel additive but it has not helped.I would be running 75-80 and when I slowed a little it would sputter and then come out of it and it might not do it again for 20 miles. Do you have any ideas as to what might be going on? I always use 92-93 octane gas.The bike has always been serviced regularly and has never had any other problems.
Thanks for your time and any suggestions you might have.
Steve

Answer
you may want to get the bike tuned up correctly. To do this a Power Commander 3R USB has got to be installed and a custom map made to correct the air/fuel ratio. there is no other way to do this correctly. the sputter is a LEAN condition. JOHNNY  602-705-7474