I have a 2013 sportsman 550 that I have swapped to a 2014 850 high output motor. All harness and other needed items have been hooked up and the bike idles. The only thing that’s not a 2014 part is the ECM and harness. I’ve already connected the harness up to all the sensors and the ECM which both are off of a 2010 850 XP. When I give the bike gas it bogs down like it’s choking. I’ve already tested the fuel pressure which reads 43 even when throttle is given. Does anyone know what could be causing this? Not sure if maybe injectors are bad, or I need to flash the ECM. Both the 2014 850 high output and the 2010 850 XP ECM’s are the same part number. I’m not sure if that means the software is the same or not. Any input would be greatly appreciated. Thank you!