Pontiac Grand Prix Radio Not Working

2001 Pontiac Grand Prix 6 Cyl Two Wheel Drive Automatic Yeah I Was Installing A Car Amp For A Friend And I Got It All Hooked Up And...

Car Idles Fine In Drive And Neutral, Drives Smooth But When You Come To A Stop Or Turn It Dies Right Out No Noises. Starts Right Back Up....

1997 Pontiac Grand Prix Gtp: 145,000 Miles. Bought The Car A Couple Of Months Ago, Since Then The Steering Wheel Controls For The Radio Quit...