My 62 Tbird has been having some problems ever since I replaced the power booster and master cylinder. The car will start and idle without any problems but as soon as I drive it boggs down and shutdown like its staving for gas. At first thought I thought it was the gas filter at the fuel pump which was dirty so I replaced it and the car continued doing the same thing. So I decided since the carb and fuel pump were old and I'm in a restoration mode I would replace them as well. Put in the new fuel system and no change the same problem still exist.

So then I go back to the power booster thinking something with regards to a vacuum problem (even though the idle is good and no sounds of a leak) could be causing the problem. The only thing I could see is that the vacuum check valve I installed from the old booster had a diaphrame and the booster had one as well. Could having two in the system be the problem?

Finally I was told by a friend on the east coast who works on old cars that it could be the coil thats causing this. I put a tester on mine and it reads 6.5 volts DC does anyone know what the Ford Tbird coils should read? Note I have pertronix electronic ignition on this car for about a year.

Learning as I go!

The coil should be putting out a lot more than that. This sounds like a big vacuum leak, I'd suspect a bad booster. When you're idling you are not using your brakes, and as soon as your rolling and press on it you'll lose all your vacuum and kill your engine. Just my 2 cents.

Take the hose off your booster and plug it. Run the car and see if it stalls under load.

Thanks for everyones help. The problem was caused by having the wrong vacuum check valve installed at the power booster. My new rebuilt booster had the vacuum check valve diaphrame already installed in the port where the vacuum check valve scrwews into. I installed a check valve that also had a diaphrame. I guess they were working against each other causingt he car to shutdown under a load. I found an original metal check valve installed it and the problem was resolved.

Thanks for everyones help.