Took the car for a decent ride today. Had to get on the hiway for a little while. 4:11's are low. Taching 3K is about 50-55mph. On the way back I had some issues. Car started bucking like you were turning the key on and off. At the time I was not sure what the issue was so I pulled over and checked all the fluids, etc. Everything seemed ok. Car started right back up and drove fine. ????? Seemed electrical. Maybe the MSD 6al box. Dont know.