Since your 400 runs fine once started and warmed it suggests a couple possibilities:
1 - The choke plate is not shutting tightly. To check set the choke knob to full, remove the air inlet tube at the carb and peek at the top or bottom the plate, adjust as required so it closes tightly.
2 - New, emissions reformulated (ie crappy) gas. The ethanol, etc. in this stuff makes it less volatile. This in turn makes cold starting (of carbureted engines anyway...) more difficult - especially as the temperature drops. About all you can do there is try another brand of gas, or else simply live with it.
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Today's Featured Article - Talk of the Town: What's The "Stuckest" You've Ever Been? - by Edited by Kim Pratt. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I was about 14 (part of the problem) when I got stuck. I was disking with a cab equipped IH 966. The window was dirty and I was driving into the evening sun. It was hard to see and it was my first pass down the field. I got the tractor so stuck that the underside of the tractor was resting on the ground. My uncle wanted
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