93 Suburban

Need help; suburban has 100K+miles on it; yesterday stalled; no previous problem; would always start back up; had towed to dealer; they cant find anything; any suggestions?

I was backing out of office garage. Died. Started back up but every time I applied gas or put into drive, died. Finally out on street, died; What should I be looking for? Woman driver needs your help

This is one sugestion.Check all the grounds on the vehicle.Battery to block,block to frame,frame to body and there may be a ground wire at one bolt of the themostate housing.I suggest this because I came across a Ford pick up that would die when put in reverse.(standard tranny)Found a ground wire broken on the rad support.
chuck's