I need some expert advise. My 2013 FLHTK just started running rough. Coughing and sputtering and popping through the mufflers. We rode 800 miles July 4th weekend and everything was fine. Rode this past weekend and its now screwing up. Almost felt like it was gonna stall at 75 mph. A few months ago I did a stage I with SE hi flow a/c, new slip ons, and a Dobeck EJK 3.0. It ran fine since until last weekend. I tried adjusting the tuner but no difference. I disconnected it and still runs bad. Engine light not coming on but checked for codes and the only ones there were for the O2 sensors, which are disconnected with the EJK installed. Checked spark plugs and they look real good. Air filter still looks brand new. Oil level good. Recently changed. Bike starts right up and idles good, but no good at all on the road. Any suggestions would be greatly appreciated. Might have to take it to the dealer, but I'm afraid they're gonna try to tell me warranty is void because of after market tuner.