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Wondering if this could be a tmap issue, I have a very similar problem on a 2015 850 SP, 230 miles and less than 50 hours. Started sputtering this spring at low rpm and is getting a bit worse, idle is rough at times and low rpm it sputters and feels like it has a loss of power. Once I get the speed up and higher RPM it seems to do ok. I only use non ethanol gas and drained the tank, ran it dry twice and fresh gas, changed fuel pump and battery and still runs like crap. Seems to come and go and runs ok at times then will go to crap and sputter bad, have had a few backfires. Pulled the plugs and one seems to be in good shape and the other has a white tip tellig me a cylinder is running lean. any thoughts
 
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