I just completed the rebuild on the drivetrain on my 68 Firebird Conv. It has a 400 motor with a comp. cam XE268H 268/280, edelbrock performer rpm, edelbrock 750 card. The th400 was rebuilt and I'm running a TCI 2000 stall converter. If I take a trip or ride in it, and go to start and drive it afterwards, when I but it in gear it quits running. I restart it and it repeats the stalling. Only after I have to "power brake" it can I get it in gear to it drives fine. What is my problem? Has this happened to any of my fellow Bird lovers? If so what did you do to fix the problem?