So I am pretty new to the diesel world. This is my first winter with the car ('83 300sd). Today the high was about 50. When I went to work this morning I started my car as normal, started perfectly, then went to leave to drive to work (I have a whole 1 mile commute) and while driving it seemed my car did not have much power sometimes. I left work this afternoon and it did the same thing, I would get going about 40 mph and it just would not really have any more power. I kept driving around for about 10 more minutes and eventually the car started running like normal, accelerating just fine. Do I need to let the car idle for a while to warm up? Or is there some other potential problem I need to be watching out for? Also, I live in Nashville, TN. It does not get real cold here, should I look into getting a battery blanket or something for the dead of winter?

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1983 300SD Turbo Diesel Automatic