I start my 91 Wrangler V6 4.0 10 minutes before I have to leave for work... but if its 20 degrees or lower outside, I can put in reverse and drive all day but when I put it in 1st gear it doesnt want to roll fwd... Once I get it rolling I can still feel resistance but it does loosen up about .25 miles in. ANY ideas on what this is and how to fix it? Thanks!