I have 400 miles on 16 with 155. Rode 40 miles and ran flawless. Went on a ride today and soon as I back off the trailer the engine light came on and debated the motor. So I kill the engine and it would run fine for a few minutes then same thing over and over. Have not changed anything yet but first I'm gonna clean power valves and put in new plugs. Any help would be great.