I have a 2008 600 dragon. Sled has 10,000 miles. Around 6,000 miles the sled developed a cold start problem. The sled will start and then shut down as if it's not getting enough fuel. The fuel is not the problem. It's not the spark plugs. Could it be bad ignition coils? I have to hit the kill switch twice and restart it before the sled will stay running. This only happens when trying to start it when it's 20 degrees F or colder. Fuel filter was changed at 8,000 miles. Would a bad exhaust sensor do this?