I recently acquired a 1992 Volvo 940 that has 46,500 original miles. The car has not been driven much over the last year and has been sitting for the past three months. I was driving it from Louisiana to Alabama and it was running perfect for about 4 hours (over 300 miles). It felt like it ran out of gas and would not restart. The tank was over 3/4 full. Any suggestions? Thanks.