94 Chrysler stalling out

Our 1994 Chrysler New Yorker stalls out when recovering from an uphill stop or sometimes a turn. The typical situation is when I climb a steep hill, stop for a light, then make a left turn. The engine dies. Also, when I slow to make a turn, slowing to 5 mph or so, it will die when I power into the turn. Two mechanics have told me there is nothing wrong and that they cannot replicate it. My wife had it on 87-octane, too low, but going to 89-octane has not helped. Any ideas? Thanks. Bob

Do you have all the standard maintenance like oil, air, fuel and oil filters, plugs and plug wires up to date?