Hello i have a Champion Gen #42451 . Bought new 3 years ago never used for any amount of time. Always put stable in & always start couple times a year. started it couple weeks ago runs fine for about 10 min then shuts off, like you turned off & fires right back up again, just keeps doing this. I thought it needed a new coil, ordered one on e-bay, put on & still does the same any idea's, Tks.