I have a 2003 fx45 and I lose power while driving. When I get up to 65 to 70 mph after being on the hwy for 30 mins my car starts to lose power. It dosent stop running I just dont have any power. I have to pull over for a few mins and keep it running before i get back on the road again. I have to continue doing this until Im on the regular service roads. When Im not on the hwy the car drives fine. Does anybody have any ideas on whats going on with my car?