Left work, started fine. Stopped by to see wife at work. Started again, on way home felt a couple of very slight power drops. Was so slight thought it might of been my hand causing it. Next morning, 35 or so, always takes 2 tries to start in colder weather, started and died. And again, never happened before. Throttled up and it started, fall below 3000rpm and would die. Headed to work and would die if I let it get below 3000, felt like it was only hitting on one and a half cylinders. Got to office bout a mile away and it died. White smoke coming out of exhaust. Started one more time to put her in the hut. Will not even fire now. 08, 5500 miles, never had any problems. Can anyone give me any ideas on where to start.