2002 Pontiac Grand Prix GT with v6

Any Ideas… Car gets hot and then no power… I have had water pump, catalic converter and the intake manifold fixed. What the mech. have all said it needed. Is it possible the car got so hot(it which it did prior to the water pump being fixed, drove to st.louis about 5 hrs, when it just just off, i am not sure how long it was running hot before it cut off…had the water pumpe replaced… ran fine for a month? It runs fine, for for about 5 mins… but once it gets warm, it sputs and sputters…