Engine Performance problem
1993 Ford Torino V8 Two Wheel Drive Automatic

i have a 1993 ford thunderbrid lx it has the 5.0 HO and my prblem is it runs and drives grate but when the moter is warm it wants to stul and dont want to start intill its cold or kool agean then it will start right up i went and boult a lextonic mouldale to day thinking it was that but it wasent its still stuling and not wanten to not start when hot ??? what cold it be ?

thank u
joe