It is about 7 below zero today and went to start the k5. It ran fine for a few seconds then died. when I started it back up it ran real rough and was missing horrible and backfiring. I tried to let it run for a bit, but no help, it just kept dying. It did this a few weeks ago when it was below zero also. When it happened that time it turned out that the ends of the spark plugs had un screwed a few turns. the plugs are accel shorty plugs. the motor and ignition are all new within the last few years. What would make the ends of the spark plugs do this when its cold. it is far to cold to mess with it tonight so we'll see how it goes tomorrow.