My 88 cad el dorado stalls out when 23mph is reached. It picks up a few seconds later without me giving more gas. It does the same turning corners. No prob in reverse or in other gears. Just drive gear.
It is difficult to tell what is wrong, without knowing what is being lost. The symptom does suggest some possibilities. You could have a problem in the tank where the baffle is moving around restricting the flow of fuel, you could have a loose connection or shorting wire that comes and goes under specific conditions. You would need to do some initial diagnosis to determine if spark is interrupted, or fuel as well.