I have around 200K miles and recently it will die at random times. At 70mph or 30mph or even coming to a stop. The majority of the time it turns over and I finish to where I'm headed. Only on a few occcasions its taken a few minutes to turn over. I've replaced the relay and now the fuel pump and all the filters. what do I do next or the mechanic? also the radio now does not have power to it...checked the fuse and its good. Are these related? Thanks