I have a 2016 Kodiak ES 700. 1 month ago it became hard to start., rolling over slowly and "spitting sound. Changed the plug and battery, added Seafoam and still doing it. yesterday i started after a couple attempts let it idle 5 min took it on a very short run , turned it off and it took 5 min to get it to go. Temp outside was -2c. Any recommendations. IOt has worked great in all temperatures until a month ago.