Driving down the interstate while passing a big truck, my GMC completely dies! No lights come on, have no brakes, no power steering! I pull over and it starts right back up. This was sporadic for a couple years (only one or two times) but now is everyday. It has been to multiple shops, including dealer, but is not throwing a code and mechanics say they can't fix if they can't find a code. Changed fuel pump but that was not it and don't have money to try the 'change all possibilities' route. Any ideas?