Cadillac Repair: my 92 cadillac devile 4.9, cadillac devile, throttle plate

Question
after driving on the highway for awhile as im getting of and in a long right turn my car stalls out and some times dies out i cant understand it have you heard any thing like that

Answer
IS or has the check engine light ever illuminated while driving the vehicle ?.

The most common problem with low speed stalling a a blackish residue buildup within the throttle plate area of the throttle body of which needs to be thoroughly cleaned off with an aerosol can of a cleaning agent available at any auto parts store. Clean the area thoroughly and see if this fixes your problem.