I have a 1995 Toyota pickup with 95,000 miles. For the past few months the truck just cuts off when it?s in 5th gear at speeds above 55 or 60. I mean it just stops. I have to coast to the side and restart it. The thing is, it doesn?t do it all of the time. The mechanics that I?ve taken it to want it to cut off at high rpms in every gear but it only happens in 5th gear. Any ideas? Thanks.