I have a 1990 Dodge daytona 3.0. I went out to go to school and it seemed like the battery was dead. So i jumped it and took cables off then it died right away. Every time I go to start i have to jump it and keep the throtle on for 5 min before it dies. After keeping it reved up for 5 min it will idle just fine. But if I but i will die right when i get off the gas. I checked the alternator and it is good. What else could this be? Thanks Chris