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Code P1356

I installed headers and a K&N filter and had the bike 2004 flhrc1 maped by my local dealer. The code is P1356 and the check engine lights comes on and goes off at higher RPMs or under load carry a passenger. Any suggestion as to the problem?:)
P1356 Codes. I have experienced the same issue with my 04 road king. Going back to the basics, I removed the side cover and disconnected all the electrical connectors to the ECM. Cleaned all contacts with electronic spray cleaner and reassembled with dielectric compound (grease). Removed the spark plug wires (yes they were genuine HD plugs), cleaned the tips of the plugs after checking them for gap and condition, wiped the tips with dielectric compound and reassembled. The problem is gone. I still pay attention to the starting process and hold the start button down until after it kicks over and is running. Hope this helps.
 
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