hi guys. in the need of some help. I have a 1995 gtp 3.4. drove to work and have no start to come home. batt. checks good and full charge. replaced starter and cleaned positive cable at that time. dash lights stay on but radio goes out when trying to start. headlamps don't dim in crank position. will start by jumping starter terminals. for about 2 seconds then shuts down. don't want to start changing parts till I no what it needs. thanks for any info.