Checked fluid levels. Everything looks good. I am leaning towards it just being cold weather at this point, but it worries me a bit that it just started this winter. ANother thing that worries me is, in the last few weeks, I noticed a DRASTIC decrease in MPG. On a full tank, I have averaged about 180-210 miles before empty. Granted, in the winter, the different fuel mixture does alter MPG, but that is a little eerie since it's about 100 less miles I am getting out of it. I think it's time to get some stuff looked into regardless.