So today after school, when I just leave my school parking lot my truck seemed to wander a bit all over the road. But after about 3/4 of a mile it cleared up and drives perfectly fine just like it always does. This is the second time my truck has done this. Its been the same situations both times, very bitterly cold with strong winds and I didn't allow the engine any time to warm up and both times I was leaving my school. What exactly could it be?